I'm getting tired of a piece of plywood for a backdoor for one of my pins (Bally Rocket III), so I'm looking to get a door made. There was a guy that had made some doors for 70s Gottlieb's & Bally of which I purchased a few, and it seems that the thickness of the metal he had used was .043" or 19 Ga. I've heard that 20 Ga is typically used for folks making their own doors.

I still need a 4-player Gottlieb (that guy had run out of them), but since it has crossing pleats, I will wait until I can get a proper one for that.