The reality is that punching perforations in the film and finding suitable backing paper are fairly trivial things when compared with making and coating the emulsion.
I think the trick is to use people's skills. One person on his or her own might struggle to do it all but a few people with different skills might do it.
e.g. I am interested in emulsion making but will probably never do it myself. However, I'm sure that I could make a coating machine and a simple jig to cut perforations if someone else wants to coat the film.
EDIT: That wasn't an offer to do it, just a hypothetical scenario!