Don't mame it.
For clarifican, the term "MAME" has nothing to do with removing the original pcb. Putting a pc in that cab wouldn't be maming it unless you altered the monitor/sideart/wiring/cp ect to do so. In other words a play on words... "mame" as in hack up, not the software itself.
Personally, though, I'd leave the pcb in it. That's the most complete game in that age group I've seen in a looooong while. It'd be a shame to monkey it up.