Very cool!
Although to be pedantic, that's not an "ortholinear" keyboard (as in a square grid) rather a keyboard with column stagger (which you should use).
I wonder if you could make it for a FW13 too? I know QMK doesn't work for 13.
Edit: I see now that it uses a separate microcontroller, so yes if you could make it fit then it should work.
Yes, something like that. Ideally for a reasonably sized 13-14” laptop.