Vacuum forming table for molding Kydex

I am hoping to possibly make a couple of my own kydex holsters for some of my guns with attachments so I made this simple vacuum forming table. I just recorded the test run of it to see if the membrane would give nice definition the vacuum press is made with a plywood box with holes drilled in a grid in the top, and the side has a hole to accept a vacuum hose. for the pressing membrane I have wooden frame with a rubber membrane stapled and taped (for a better seal) to one side so that I can evenly l