So I have a crazy project underway that entails shooting long strips of film. I intend to buy some Hewes 35mm 75ft reels but I have no tank which will fit them.

So I'm thinking about going to a hardware store and buying some wide diameter tubing and attempt to make one with tubes and connectors.
The reels are 7" in diameter.

My biggest question is: Should I be concerned about the material with which the tube is made? Regular PVC would work? Or should I strickly adhere to a stainless steel regimen?
Anybody have any experience with this sort of project? Any ideas of heads up would be Welcome!
And I'd be sure to share my good or ill fortune along the way!