One important thing is to get a model of the overhead projector that has a focal length of the lens that's close to the one of the enlarger lens you want to use, this is because the fresnel in the bed is optimized for that range.
Here there is the spec of some 3M models. file:///C:/Documents%20and%20Settings/P.PC6/Mis%20documentos/Downloads/9050.pdf
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Until now I used it with temporary (metrology) fixtures and a regular mirror, I'm to building that design that has to also be a test bed of a lightweight/amateur 8x10 horizontal enlarger, I want to test solar fresnels and first surface mirrors.
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