I'm building my first controls as we speak, everything is done except wiring.
It started out as a GameCube stick (for Ikaruga and SCII, basically), but after two fried circuit boards, I decided to change my console to PS/PS2 (just bought Virtua Fighter 4, after all).
Attempted it today, it looked easy, but...nope. Oh well, only five dollars wasted. Tomorrow I'll try again!