In one of my "just for the hell of it" phases, I made a jig for cutting down 35mm film to 110 size (16mm). It has two blades correctly spaced and guides 35mm apart. I load a 35mm cassette with FP4/HP5, feed it into the jig then switch out the lights. One swift pull and I have a strip of 110 width film. Having disassembled a 110 cartidge, I then spool the film and backing paper together, place in the cartridge and reassemble. There are a few provisos, not least that most 110 cameras require the perforations that cock the shutter and/or stop the film between what would normally be pre-exposed gaps. The Pentax 110s, however, don't rely on the notches and all is well as long as you can live with a steadily increasing frame gap. Development is straightforward, as my ancient Johnson tank will handle 16mm. It's not as hard as it sounds once you get the hang of it. Of course, another option would be to buy 16mm cine stock and sacrifice part of the picture area to perforations.
Cheers,
Steve