I finished installing the SD cards. I came across 3 or 4 more that had corrupted data. I also reinstalled the Raspberry Pi and the USB converter for one of the controllers. I am trying to do a better job of cable management this time around, so I routed the button wires between the buttons. I will probably put some small zip ties on them to keep them neat.
I’ve also been thinking about gluing down the SD card holders so that they’re not just dangling. The only real estate that I consistently have for this is right behind the corresponding display, as shown in the next two images:
My Arcade Machine Build 