I bought a used Apple M0110 keyboard on ebay, cleaned it up and wired it to a Teensy 2.0 for USB connectivity.
This keyboard makes the MX blacks in my Leopold feel soft and squishy ... and it is LOUD!

Album of pics @ flic.kr/s/aHsjG5SDsv


Infolinks:
Teensy - www.pjrc.com/teensy/
Code for the Teensy with my slightly customized keymaps @ github.com/waz0wski/tmk_keyboard