I've seem some topics here enquiring about special keyboards: with large keys, to work in aggressive environments... things that are simple but you don't find anywhere or when you find it costs much money.

well, this page has a guide for a home-made (or home-modified, if you prefer) AT keyboard:

http://www.modasylum.com/keyboard.php

the mod uses just the controller from a standard keyboard. using this guide one can take the same approach for some specialized keyboard.

hth

orlando