Upthread I worked out some of the details needed to shim the hinge to allow more height and I think it’s reasonable. Agreed that the depth constraints are very challenging but I think there’s a reasonable way around that.
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Board arrived and RP2040 works (after a little bit of resoldering the USB-C connector, which wasn’t assembled quite flush). I’ve got the basic matrix mapped out with the help of a little circuit python script running on the rp2040. The next step is to figure out the LEDs and the trackpoint.
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Making decent progress on the pinout:
For some reason I can’t figure out how the FnLn, Mute, MicMute, and CapsLock LEDs are driven. The diode checker on my multimeter doesn’t show any obvious suspects, and driving the unassigned pins high or low doesn’t do anything. 
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If you can find the schematic for the laptop it goes into things like this get a lot easier
Edit: I did find a jaguar 2 schematic floathing around on the internet but the keyboard connector on that thing is like 45 pins not just 20 so not sure I got that right.
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So referencing back this, I’d REALLY appreciate it if you’d also evaluate if a standard pop-rivet size can be used as well. Some of us have the tool, not that it’s very expensive, and could use those as well. Or possibly make the interior threaded, and use some wide headed small screws? Ideally with some threadlocker of course.
This was good advice and I did find the schematic online after some digging. It turns out they are active low, but there’s a necessary 3.3V power connection I hadn’t previously identified. Anyway, I understand the purpose of all the pins now, it’s just a matter of building an appropriate QMK against my prototype – and then probably doing a rev 2 of my board with everything neat and tidy (and an MCP23017 I/O expander to handle the 16 DRV lines). Maybe I’ll try to include the appropriate pogo pin connector for the Framework 16 Input Module, although without better docs on the exact mechanical specs, I can’t pretend that it would drop in and Just Work. As mentioned above, with the built-in mouse buttons, the X1 Carbon Gen 10 keyboard exceeds the height of the keyboard module by 21mm, so this would be a “double height” replacement that would replace the touchpad module as well – and the touchpad module specs haven’t been published yet. But with a pogo pin connector maybe I’ll qualify for the Input Module developer program. 
(What would actually be most helpful is a STEP file of the entire chassis top, minus the modules. I don’t need assemblies or details, just the location of any protrusions, etc, so I can slot in my own design in CAD and check for intersections, or print out a mock up and test fit things.)
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This entire thread excites me, I’ll be keeping an eye on it
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I have very long ago outsourced storing my knowledge to the Internet so I put trackpoint protocol “chx_” into Kagi and yeah I did post the protocol a few years ago: it’s PS/2.
https://reddit.com/r/thinkpad/comments/p4i52h/til_to_this_day_trackpoint_is_a_ps2_mouse/ links to IBM TPPS/2 TrackPoint which has a short list of ThinkPads using ps/2:ibm-000a-tpps-2-trackpoint.
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It’s a PS/2 mouse with some IBM extensions, apparently. The ones which report TPPS/2 TrackPoint anecdotally behave much better than 3rd party replacement keyboards which sometimes have trackpoints which report as just “Generic PS/2 Mouse”. I haven’t dug into the details to figure out why that is.
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Looking at https://github.com/torvalds/linux/blob/7ed2632ec7d72e926b9e8bcc9ad1bb0cd37274bf/drivers/input/mouse/trackpoint.c and knowing my beloved little red nub, that’s because of the inertia settings in there. That’s what makes a TrackPoint more than a pointing stick: the negative inertia.
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This is an image from the framework website, but copying it here because it’s a very clear picture of the space we’re working with on the FW16. Any “too tall” keyboard (like the X1 Carbon I’m working with) needs to navigate the row of pogo pins running across the center of the usable space, as well as the white brackets on the sides. On the other hand, just above that is some extra depth that could be exploited for your driver chips, FPC, etc.
In another thread, @Josh_Cook mentioned a plan to create a facsimile of the complete upper deck of the FW16. That would be super-useful for Input Module developers, even if it was just a STEP or STL file we could 3d-print as a mockup or import into CAD.
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While I’m uploading screenshots, here are some clear pictures of the FW13 hinge assembly discussed upthread, screencapped from this iFixit video.
It looks like I misidentified the new piece which would need to be fabricated: it would be these:
I think they still ought to be able to be 3d printed in metal with altered dimensions for a not-unreasonable cost. It would be the flat part between the “curl” and the “bend” that would need to be a few millimeters longer, depending on how much clearance your dream keyboard/trackpoint required. Some alteration of the bezel might be required, and you’d probably need a matching spacer at the top of the frame for the screen to rest on when closed.
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Corresponding pictures from the iFixit framework 16 review:
Not quite as clear as the closeups in the FW13 video, but it seems like there are two places where extra millimeters might be added, marked with the red arrows, and in fact it might be possible just to put a flat shim underneath the hinge at the location of the blue arrow which would be Very Easy Indeed if true.
EDIT: the hinges are already in the Framework store: Framework – nice pictures there; I’m hoping I’m right about a flat spacer being all that’s required. They are/will be also selling the midplate for $99 which would one way to “mock up the top surface”, although a bit more expensive than a STEP model would be.
(@nrp if you had an extra refurb or not-consumer-quality midplate lying around, I’d love to borrow it for test fits!)
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Why 3D print an entire new part? We have the specs on the screws, get a matching spacer machined (or printed) and get new screws to match the new spacer depth. Goes underneath the hinge to add a bit of height from the bottom of the chassis. Only concern would be the length of the cable to the monitor, but I suspect a couple of millimeters might be just fine. Would definitely need some care and checking tho.
Probably add some appropriate thickness rubber bumpers for the top edge of the monitor for when it’s closed to be approximately flat.
We should distinguish between talking about FW13 mods and FW16 mods here. I agree it looks like a simple spacer will be enough for the FW16. For the FW13 the geometry is a little more complicated: on the display side the hinge sits behind the screen, so you can’t just add a simple spacer “underneath” without pushing out the screen as well. And on the FW13 the “mainboard side” of the hinge lies parallel to the top surface, so you likely can’t add a shim there without making room above it somehow. Given that 3d printing costs are roughly proportional to volume, not complexity, it’s actually cheaper to replace a “small but complicated” piece like the hinge than a “large but simple” piece like the top surface. On the other hand, there’s a spring somewhere in the FW13 hinge (I can’t quite see where), and that could complicate replacing “just a piece of it”. YMMV though, especially if you’re inclined toward hand-crafting pieces rather than 3d printing; I’m just throwing out ideas for discussion at this point. I don’t have a FW13 (I’m in club FW16) so I don’t have a particular dog in that race.
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Ah, I see. Wasn’t paying too much attention to that.
But yeah, I’m a FW16 Batch 12 myself, so a ways to go. But definitely wanting this with interest.
Hmm…I just realized, UltimateHackingKeyboard has a trackpoint module, using it as we speak actually. I wonder if I could mod that and have it in place of, or next to, the trackpad. Or keyboard. Hmmm… Future project after I get my FW.
Or maybe utilize some of their designs to put together a thin mechanical keyboard with a trackpoint.
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WRT 3d printed metal modified hinges on the FW13, I do have concerns about toughness of SLS metal compared to the original. If I were putting this in an F13 I would consider a modified design rather than just stretching the original bent steel design a few mm taller.
I would want to use the thinkpad trackpad as well, which probably means a whole new keyboard bezel, or modifications to it. I think that the one thing really wrong with thinkpad keyboards is that red button in the middle that gets in the way and is totally useless as a mouse (I know that’s a hot take in the thinkpad crowd! 
), and I want physical trackpad buttons. I’ve tried the FW13 trackpad (a family member has one) and I can’t stand the virtual buttons.
I was thinking that if the hinge is offset, raising the monitor slightly, 3D printing a TPU/TPE bumper that goes all the way around the top and sides of the bezel, rather than having just a few nubs, might keep the dust out when it’s closed. And the magnetic bezels make it easier to attach without worrying about getting glue on the screen… 
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Yeah, having seen the FW16 hinge assembly it does look like it would be pretty easy to add not just a single millimeter (which I think is the minimum necessary to support the latest generation trackpoints) but several, which would open the door to a lot of interesting mechanical keyboard mods. What’s more, because the input modules are so easy to swap, you could even forego the hinge mod and make a nice mechanical keyboard for home use, and swap in the stock keyboard (or no keyboard at all) when you want to fold it up to carry around.
If a hinge mod gets popular, I could even see Framework carrying an extended hinge and a “thick bezel” with a bumper as you suggest as user-swappable parts. We modders would probably have to agree on exactly how much extra space we’d want, which would be the hard part!
We’ll have to agree to disagree on the touchpad and buttons, though. I’m firmly in the “three buttons” and “no touchpad” camp.
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I dunno…I’d just pull out the keyboard and DIY a carry case for it, open up the Framework and put back in the nice keyboard. I’d just rather not have to do all that of course 
Although for work since I’m hybrid, I do cart my UltimateHackersKeyboard to and from work the days that I’m in the office, lol. My current keyboard (a Tuxedo) is pretty mediocre, and sadly it’s not ANSI, so sometimes I get a bit messed up with some of the keys.
I would really prefer some hardware buttons for the trackpad regardless. But I’m in the trackpoint camp myself 
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I’m getting ahead of myself a little, but I laid out a board in the “small module” form factor to start acquainting myeslf w/ the input module system.
Schematic and layout sources at: GitHub - cscott/X1CarbonGen10
I’ll probably chop off the (unused) top of the board before fabbing this – and I want to wire up my earlier prototype boards (photo upthread) to match the pinout of this one and get a full firmware running to make sure I’m not missing anything. If I understand the midplate design correctly, this board should fit inside the depressed channel in the middle of the midplate, and thus not take up any of my height budget. The position of the FPC connector here is just an optimistic guess at this time, though.
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