Now that I had the whole thing working (as an educational exercise, remember?) I stuck it all on a small painting canvas while I sorted out what to do next without accidentally yanking things out of the breadboard.

After I'd gotten bored of that I stuck the whole lot of it back in the original case, loose breadboard and all, and moved on to my main cyberdeck (check that build log too). I wasn't sure if I'd build up a proper control board, reuse this keyboard in some other case, or what but at least it was a complete-enough thing to be used, which was more than you could say for the last couple decades.....