So, I've been modelling the case in Fusion 360. I'm designing it to be fairly modular - the buttons will be on a breakout pod, for example. It's been a good way to learn how to design to real-world components.

My first attempt at printing out the casing demonstrated that while a 1mm thick wall is just fine if it's sheet metal or injection molded plastic, a 3d printed case needs to be more robust. I also need to design larger tolerances into my designs - my 3D printer is good, but not that good. :)

I'll be releasing all the design files as I build them - .stl and .step, so people can edit them to their needs.