Right. I'd meant to write up the pricing.

Keys - $0.80 x 78 Diodes - $2-$3 3D printed shells - $240 from Shapeways. Cheaper from a friend with a makerbot Keycaps - Cheapest when harvested from a board found at goodwill. Otherwise, $35 or so from WASD Teensy++ - $24

I'll leave the "priceless" joke to the peanut gallery.