pi400 keyboard mask

Using the model this remix is based on, I enlarged all the key shells by a factor of ~1.08 and subtracted them from a generic rectangle to use on a pi400 shell project. If you want to create a full shell for a pi400 keyboard, this key cutout panel can maybe help you out.

Freecad file is included, along with the meshmixer file I used to perform all the individual key scaling from the original model.

This is for the US keyboard layout