My cabinet (avatar) took a similar hit, though it wasnt to mame but rather a different arcade game... Prisoners of war to be exact, I dont know who the operator was, but he converted a fully working megatech (with 2 monitors - 2) to a prisoners of war, with the wrong video harness so the picture was crapped, and also ripped out the top monitor (as jamma didnt need it) and left a big ugly hole in the top with wires poking out.
I wish I could meet the guy, just to know what the **** he was thinking =).
I'm only 15, but I'm totally against mameing classic cabs (less so if its reversable), so I was set on restoring my megatech (1990-ish) back to full and it is, apart from the monitor which im repairing now (and about 1000 connector blocks I had to use to wire the thing back to the original way - its a dedicated cabinet, no jamma). Oh, on that subject, does anyone have any better suggestions other than using connector blocks? They do look a bit ugly when you get in there.
P.S. A couple of the parts I used to restore it, like the top monitor, came from a MAMED (non-reversable) megatech machine... Ouch that hurts.