Noboby seems to have answered the question you asked: the dimensions of a 220 roll. Offhand, I don't know either but if you want to PM me a postal address I'll send you gratis a long expired, unexposed, unrefrigerated roll that you can experiment with. I don't think we can actually buy 220 film here in AU any more and AFAIK Portra is the only emulsion available in 220 anywhere. Good luck with the project. OzJohn