I'm interested in cobbling together a simple, lightweight, compact-as-possible fixed focus 4x5 P&S with a salvaged 120-150mm lens. Something like a pinhole box with a lens. I'm leaning toward aluminum sheet metal construction with a grafted-on front end/lens board from a junker camera, and either front or rear shims for focus tuning. Anybody know of websites with how-to in this area? I've found a few but they were mostly oriented toward using a ground glass back.