I was reading the pinhole thread earlier tonight and i decided to give it a go. I made a 75mm camera with a 4x5 back from 1/2" black foam core in about 2.5 hours. It's all held together with hot glue and overlapping joints. I added paper tape overall to prevent light leaks. I think the clothes pins and bamboo print tong should hold up pretty well. I'm using a very small sewing needle pushed through photo black paper tape. I shot a couple polaroids and it seems to work.