I'm pretty happy so far with my Model M Frankenboard:
I'm going to make some additional modifications:
1) Add an additional modifier key just to the left of the right shift key. I want it for additional symbols (perhaps a set of APL keycaps).
2) Figure out a good way to print my own keycaps. Unicomp can only print certain symbols (and not always the ones I want). I've tried clear stickers (which look good), but eventually, they come off.
3) Change my controller code to make a key-programming button on the back of the keyboard. Press the button, press a key, enter the key's new 4 digit scancode.
4) Use the metal-plate and rubber-sheet from by old 1986 Model M 1390120. That change should go a long way towards improving the feel of the Unicomp board.
I'm working on a way to build a board that looks like this:
I've been trying to make individual Model F switches, where the hammer strikes an individual membrane mounted on a small piece of plastic. Two pins protrude from the bottom of the plastic so that the switch can be mounted on a circuit board. Then I just make a new upper metal plate with holes drilled for all my switches.
