This case is designed based on original 2D files made by keebio: https://github.com/keebio/iris-case

Top plate is 1,6mm thick and square holes give tight fit with Kailh switches. I added solid sides as part of top plate and created holes with M2 threads. Middle holes match PCB holes on Rev 4 PCB.

Bottom plate has support for PCB and bottom holes have cone shape so that screws are flush with bottom surface.