I haven't figured out, yet, how to make contact with these. If anyone knows, drop me a line. You can just barely see one of these sheets in the top of the next picture. I did all of the wiring before cutting the board, because matching traces after the fact would have been much harder. Doing the cut I used a jig saw to do the cut, which I don't recommend, especially if you don't know how to safely use power tools.
Power tools are dangerous.
A reader suggests using one of the exacto knives with miniature saw blades. I'm leaving the following notes on using a jig saw, but you're probably better off with the exacto knife solution. Cutting pcb is about like you might expect. High blade speeds and slow forward speeds are less likely to rip circuitry off the board. Cutting the plastic frame of the keyboard required slower blade speeds.