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.

It also bothers me that the meaning of "ortholinear" has been lost, but at least it's a sign that the hobby has grown to a certain point.