This info has been in the Game Consoles FAQ forever...I'm a little surprised you didn't check their first Frost. 
heh.

You know I checked every link possible (some were broken like you said), lest I anger the gods. Even looked up the FAQ by citnzfish....there was a link for a madcatz controller, that's about it.
If you do update - that link above would be a good one. I picked up 2 orig sega controllers from software etc for 7 bucks each last week, so they are darn cheap if anyone is interested, and the soldering job isn't really as tough as the guy makes it out to be.
EDIT: after I get them hacked I can take pictures if anyone's interested...though you probably wouldn't want to see the rat's nest of my cabinet wiring