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Here is a useful French site: http://disactis.com/
Belgian site for most chemicals: http://www.le-lion.be/

With my concocted 5x7 camera using old Ilford paper with a superb Goertz 210mm f9 lens

Remember that people are constantly throwing out old flatbed scanners wherein there are belts and lead screws of all sorts(support recycling) :-)
Tons of good wishes with the project and I will...

I just think a frame (sturdier) and not pillars for the front standard...
Do you intend to make it fold up into the rear?