Almost nobody uses projectors anymore. Be patient and one might turn up for free. But MF projectors were never common to begin with. They run a bit hot, so to keep the film flat you'll
need AN glass mounts. These do turn up from time to time. Lenses can be subsituted. Some graphics
process lenses would do a good job, and are cheap these days, though a bit slow per f/stop. One
could simply make a med format or even LF projector; but again, cooling would be important.