This was a simple arcade controller I made with the laser cutter, an Atmega 32u4 board, and some arcade buttons. Another simple project. It worked pretty well for quite some time, but I just plugged it into my Windows 10 computer and I got a lovely BSOD, so I might want to revisit this one in the near future.
I know I'd go for a Teensy LC if I made another one of these, and maybe give it the IIDX treatment with nice lighting modes. See below for some pics and my CAD file from the laser cutter.