Say, why not take one of those Unicolor or Beseler processor tanks (or whatever type has the light trap filler), and make a camera out of it.
This seems to solve the questions of a vessel that looks and acts like a camera and a processor tank simultaneously. The pinhole/shutter needs to be leakproof, that's all...electrical tape? Then you'd just need to be sure to get the moisture out of the pinhole before the next shoot. Murray
