I like the Polaroid 100, metal body and tripod ready. Do a battery conversion and the only problem is you will occasionally find one with a bad electronic board easy to make a pin hole camera out of those. clean the rollers, and start shooting. The 110 a and B's are the Cadillac's. The only tools I use are a hacksaw and file, mine may not be as pretty as the pro's conversations but they work great. Only problem is finding the camera for a decent price with a good lens, then get a back, I have even used backs from the 100's, a lot more work testing and fitting. Plus lots of information to be found on line.
David