Call me crazy but I think a “adapter kit” to use a 13 main board in the 16 would be very helpful.
I dont need either the expansion bay shells, the big battery (but I guess if you can get it working it would be nice) or even all the ports; just some brackets and extension cables for two ports of the opposite side, and the USB hub for the keyboard.
They have the same display connector and camera connector.
Offset to the right might make more sense, we can use the empty space for the expansion bay connector for maybe some air to get out.
Keyboard connector is probably the most challenging so far. A USB hub is definitely needed for that, and the framework 13 dont come with a onboard USB connection beside the fingerprint reader and the display connector.