If you mame it, keep it setup as gorf if possible. This way you can always switch it back to gorf if needed.
I kinda did the same with my cabinet. I mamed a Centipede that was converted to Sky Soldiers and kept the Sky soldiers board and electronics all in tact. I just added my computer and a 21 inch computer monitor. The old original monitor needs a little work, so I figured I would keep it and fix it when I get time. I can easily convert it back to Sky soldiers or Centipede, although I would need to get a Centipede board. I've also heard of people making their cab run mame and a jamma game with a flick of a switch, maybe if you're up for that, it would be a good option? I think the big issue with maming a classic would be if you totally tore it apart and modified the cab in a way it could never be restored to the original state.