Hello. I am attempting to build a large vacuum chamber for woodworking (used to infuse wood with resin/stabilizer). I would like to use a cast iron bathtub, similar to the one pictured as the vessel. I would ideally like to use a clear acrylic lid (with a rubber gasket) like the one on my little vacuum chamber I've been using. Can someone tell me if this is possible and if so how thick would I need it to be? would 1"-2" work? bathtub dimensions are 60"x30" THANKS!