John from Team Droid has great instructions, with step-by-step photos, for how to build a 30-shot 120 foamcore pinhole camera (phew!). He writes:
It all started on a long plane flight in the beginning of 2006. I was doodling in my Moleskine notebook and musing about pinhole cameras when and idea struck me. What if I made a camera that was panoramic and high capacity at the same time. I had been shooting with my 6×9 medium format pinhole (120 film) for a few weeks and was happy with the images but wished I could get more than eight shots a roll and have a wider field of view. What I thought was if I moved the pinhole closer to the film plane and rotated to aspect 90 degrees I could get dozens of images on a single roll of film and still get a pretty good sized negative. Turns out I can get about 30 images on a roll and even a quickly made pinhole will produce a satisfactory sharpness.
Check it out at Team Droid
Via the f295 Pinhole Photography Forum