Mad Catz Control Pad Pro (original XBOX) pcb schematic needed

I'm hacking this pad into my arcade stick:



The d-pad had a fairly obvious common ground, but the A/B/X/Y/black/white and back/start buttons are less obvious, anyone know of a labelled pcb image for this pad?

I have tried googling around, checked the shoryuken forums, but to no avail.

Here's a pic of the actual PCB I'm working on, I've labelled the buttons I need to connect:



On a side note, does anyone know how to get a Normally Open digital signal from the triggers on these controllers? They have 3 solder points on the underside of the pcb.

 

Looks like the top half of A, B, X and Y are connected to a common ground pretty much surrounding that area.

 

You know I didn't even notice that when I was labelling the picture, and my ageing eyes certainly couldn't pick it out on the actual pad! Looks like there's a common on the lower part of the back/start buttons too.

Guess that's that figured out, anyone got any input on the triggers, I don't need 8 buttons on the arcade stick, but there already there so I guess I could use them for kickx3 or punchx3.