Hellfire Electronic Drum Systems (http://www.hellfiredrums.com/) is a great resource for eDrum DIYers, with detailed walk-throughs and templates for creating your own robust and responsive electronic drums and cymbals.
The EXC-1 Cymbal Module is currently available in their custom diy edrum store (http://www.hellfiredrums.com/store).
(http://www.hellfiredrums.com/wp-content/themes/talian-10/images/hellfirelogo_websize.jpg) (http://www.hellfiredrums.com/)
Don't forget to check out Phil's Hellfire Drums Podcast (http://www.hellfiredrums.com/archives/category/podcast)