I'm nearly finished with two 120 roll film cameras ( one ~ 57mm "focal" length and one ~ 80 mm) based on Jon Grepstadt's sketch. The shutters need a little more work & I should be able to try them out next week. I've been using a couple of plastic 35mm cameras from the local Goodwill Store (99 each) that I converted to pinhole & can hardly wait to see the results from a 120 negative. I think my next project will be a 4 x 5 along the lines of the Santa Barbara or Leonardo cameras.