I'm uneducated in Physics so I'm not sure where to begin with this. I want to build a vacuum chamber that is rectangular and fairly flat. It will measure 48"X96"X8" I plan on constructing it from clear polycarbonate sheet on one face (would clear acrylic be a better choice?) and aluminum sheet on the other. The narrow sides will be either polycarbonate sheet or some sort of epoxy resin. I know my chamber will be dealing with ~14 psi coming at it from all sides, and my common sense tells me it will need to be reinforced with supports (I'm picturing something like rigid thick walled polycarbonate tubes spaced every 12") internally to hold up to the pressure. If anyone could advise me how to go about determining things such as how thick of walls I will need, and how thick of internal supports are needed, and how often to space them, etc I would be much appreciative.