@BulletzQS Yeah, I’ve seen it in this thread. I’m taking the complicated route because I want to keep the macro pad 
@Axel_Hartmann Hehe. I like that idea. Not so useful next to a full keyboard but I might add it anyway. Do you know of any FOSS software that already implements the Palm input method?
You will need a free set of pogo pins with USB. In practice, this means that it is best placed below a double-width module like the macro pad or numpad. I think all of them have must use the USB pads on the left because of how the config resistors are defined, so the right ones are likely free.
@Alan_Pearce Yes, this means that it can be on the right side.
There are additional pogo pins that are covered by the touchpad module. The three in the middle have I2C and are not useful for this module but I think you could swap epaper and touchpad while keeping the macropad to the left. You could also try more creative ways and 3D print a smaller touchpad module.
@TheLPeink @Iron_Raptor I don’t think that this will ever be viable as a product to be sold. The original Framework modules are easy to install and hard to misuse. Their spec isn’t meant to allow this kind of module (which is exactly why I wanted to try it anyway ). It will never be as robust and you can certainly break things if you misalign the flex cable. Thus, customer support would be a nightmare.
Nonetheless, I’m publishing all the design files as usual so anyone can build it and modify to suit their needs. I suggest that you ask at hackerspace/makerspace/Fablab in your area if you need help with soldering and 3D printing the parts. I expect that the cost will be 30-80€ — depending on whether you find someone to pool orders (e.g. you cannot order fewer than five flex PCBs).