I originally wanted to come up with a semi-universal way of designing retro-inspired easy-swapping cases for various SBCs but since I don't really have much of a need for it myself and since SBCs and ARM are just kinda shit my desire to do it kinda died midway through.

The general idea feels legit so I might like have a blog post about it or something (basically most the shell is one model, all 4 sides have an IO plate slot like PC cases, then you have a standard-sized bottom plate you can snap in/out that mounts the SBC/any other components.)