Well I bit the bullet and went out and got one.
Took it apart and snapped some pics.
I've never done any soldering to gamepads before does this one look pretty easy?
Here's what the board looks like

Left hand side with D pad, start and back buttons

Right side with buttons

Any hints on solder points? I think I have to scrape the carbon stuff for the buttons...The hardest part appears to be soldering the start and back buttons.