I have just picked up a Judge Dredd that was listed as non working, but really it was just the DeadWorld motor that was gubbed. I spent 5 hours taking it apart and it turned out that it was one of the gears that was slipping on the shaft. I expanded the collar to make it a tight fit again and it now works like a charm.
I also picked up a High Roller Casino in bits 4 month ago (even the back box was snapped off and with boards missing) and after a lot of thinking and parts finding it is finally up and running as of today. So I am pleased you are going for it.
More people like you please.
Eric