Ah, summer, the time to neglect thinking and just build crap. So, much as with the
DIY Clean Room, I started gathering bits to make the DIY Vacuum chamber.
I'm building a vacuum chamber to make sure that my satellite doesn't go kablooey when it hits space. Vacuum is a nasty environment. We have no pressure, we have outgassing, and (least we not forget) we have the simple removal of air.