Thats tough.. I am sure bondo would hold normally, but once you thin it out so it is the same thickness as the metal chassis, it's not going to be very strong at all.
My second hobby being arcade game collectiong/restoring it reminds me of dealing with a crappy Control panel on a conversion game. most of us put a new panel over the old one, and re-drill the holes. Bondo only works if you let it be thick enough to have strength.
theres no way you could re-use the bandit holes?