Thanks for your reply and advice. I looked at the brass shim material package and found that the thickness was 0.010 which is the same dia. of the pinhole. I will be looking for something in the range of 0.005.
Your project is very nice, I had noticed it a few days ago. The film transport cartridge looks very adaptable to the pinhole camera. I wish you luck with the project. The camera that I built was my first, still trying to zero in on the exposure. First film was a bit thin so I will be doing a number of test shots during my next weekend.