Itsy bitsy tiny update on this baby:
During Eurocade 2012, I noticed some weird sound problems on that cab.
At one point, the only way to get sound was to leave the back door open, each time I was closing it the sounds stopped.
Last weekend I inspected the cab with my friend 4l4in and he immediately found some cold solders on the solder side of the filter board.
We noticed at least 3 culprits and of course when we pressed them, the sound from the game was coming and going.

So we decided to reflow them all, just to be on the safe side.

We flipped the board and put it back in place and it now works flawlessly!

Still some cosmetic work to be done and it will be ready for Eurocade 2013!