If you want to shoot roll film behind a Petzval lens, then the thing to do would be either get a medium-format SLR with a focal-plane shutter (Hasselblad 2000 series, Rolleiflex SL/SLX/600x series, Pentax 67, Kiev for a few examples) or get a 4x5 and use a roll-film back for it. You CAN use a Petzval with no mechanical shutter if you want - you'll just need to use either excruciatingly slow emulsions or get really good at using a lens cap/hat/darkslide as a shutter. Traditionally Petzval lenses didn't need shutters because they were being used with wet plate or later dry plate emulsions, which had a rough equivalent of ISO 0.5 to ISO 4. You don't HAVE to get all fancy with machining - I've seen someone take a body cap for a camera, drill a hole in it, glue a piece of appropriate-sized PVC to the cap, and then insert the barrel of the Petzval lens into it. You focused it via friction, much the way the lenses were originally used. I've even seen one with a bag-like "bellows" made of duct tape for focusing that allowed some (rather imprecise) degree of perspective control.