Here's a thing I made, a keyboard case for a Behringer Model D synth module. I designed the case in Tinkercad and built it with hand tools and some scrap boards and a salvaged drawer bottom and the guts of an old Alesis Q25 MIDI keyboard I found in a Goodwill. It works pretty good. I ended up eventualy selling it on Reverb for a wee profit but it was a fun DIY project.