Cute! And just when I thought there weren't any more toys to buy.
To address two points: You wouldn't need to work in total darkness, unless you had panchromatic emulsion (probably unlikely). It's very easy to see in red light, especially if you're lit with red LED's. Unless you had a magic loop coating machine, you'd need to coat first, let the emulsion dry, and then cut out the film strip and perforate it. If you perforated first, the emulsion would fill in the holes. Dry emulsion is almost as tough as plastic.
Attachment: The selvage from a 32" strip of 120 film.