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Thanks for the extra pics. That definetely helps more but also raises more questions because it looks like you've changed your design since the original post. One question I've had is how thick are your lexan sheets in total? Would a half inch thick piece work? Should I get the 2.5 cfm or the 3 cfm pump from harbor freight? What is the pressure gauge for, do you keep it at a certain pressure? I'll probably have more questions when you answer these I apologize but I want to get everything covered.
I have a 1/4" sheet of lexan over about a 9-10" pot with a little bit of deflection, but not scary for lexan. 1/2" would be plenty and is what I would use next time.
i agree 1/2 inch lexan is perfect for this application, im using four 1/8 thick lexan pieces making it 1/2 inch thick. a 2.5 or 3 cfm pump will both work perfect so that really doesn't matter. i also believe that having a pressure gauge is very important in order to control everything and get consistent results.