You could do worse than buy an old Durst enlarger frame to support the camera; film on lightbox on baseboard and camera up on the column in place of the enlarger head. However, if using that system, you really need a camera that allows for the use of a non-pentaprism focussing option - a waist-level finder at least. It's not very practical having to stand on boxes to peer down into a prism, and you don't want the setup to be low near the floor because of dust - nature will already afford you enough spotting as it is.
Of course, if you own an MF digital camera and a medium-length micro lens for it, you're ahead of the game due to larger sensor.
I use a manual AIS(?) 2.8/105 Micro Nikkor and it's wonderful.
Rob C
P.S. Having just read Fred's post on this topic in another thread, with the budget he has available and the additional agenda re. his friend, I'd forget the sytem I just outlined. However, for anyone else where cash matters, it works.