I built this instant film pinhole camera last night. The process took about three hours from start to finish. While this isn't a real step-by-step, here's how I did it. Please realize, nothing in this is 100% accurate, which suits me just fine. It's part of what I love about pinhole photography. List of materials/tools: A Polaroid CB-103 film processing unit (more about that later) Foam core board (like poster board, only much thicker); most drug and grocery stores carry it for about $5 a sheet, which can make several cameras A razor blade knife; I use an xacto-style knife, available at hardware and craft stores for about $5 Gaffers tape; in my experience I've found this tape, which is expensive (about $20 a roll) is the best at making cameras; a single roll will last a very long time Flat black paint (only if the foam core is a color other than black); cheap is fine, I found a can at Home Depot for about 99 cents A ruler; I prefer to measure in millimete...
It ain't holy unless it's pinholey