I forgot to say that for shorter lengths of film, about 10-20 ft, a 
hand-cranked jobbie would be much less complex than a motor-driven one, 
not to mention far less expensive. The determining factor then would be 
the size of the tank. Different film widths could be handled by having a 
fixed bottom flange and a moveable top flange on the feed and takeup 
spools so you would only have to fill the tank deep enough for the 
particular film. The guide rollers, if any, would be constant and might 
not even be needed. In the Morse tank they were mainly to keep reversal 
film at a fixed distance from the exposure window.
   I have little experience at thermoforming large sheets of acrylic but 
more in forming PVC and Kydex (a PVC/acrylic alloy designed for easy 
thermoforming). It's too damned labour-intensive to make only one and 
making several means you have to be crazy to not make molds, probably of 
wood. Ideas?     bye, sid.

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