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.
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.