The 4x5 hand wired matrix I've been working on is now working properly using an atmega32u4 and running the
QMK firmware. It's using Gateron greens. :) Next step is a wood case and a riveted top layer to drape over the switches, thinking either leather or velvet.
Picture of what it looks like from the back (rows have since been soldered and some of the uglier joints along the columns were cleaned up)