ok here are some pictures of the wiring.
controller with base plate off.
orange wire location on board
http://lh3.ggpht.com/_wL3f1bGat8Q/Sn...1249137454.jpg
purple wire location on board
http://lh3.ggpht.com/_wL3f1bGat8Q/Sn...1249137547.jpg
wires connected to buttons (red wire is from buttons)
http://lh5.ggpht.com/_wL3f1bGat8Q/Sn...1249139012.jpg
finished product
http://lh5.ggpht.com/_wL3f1bGat8Q/Sn...1249140170.jpg
I'm going to add another small button to relocate the map function later this weekend. I'll add info on wiring that later.
Hope this helps,
Rev