Ok, I think I have the picture. Not having shopped around, I don't know what prices are of commercial components, but this is something for which, a couple of decades ago, I would have reached first for the Berg catalog.
BTW, if you're interested in a fine piece of photo equipment that has a nice micro slide that can be removed and used alone, I have a perfect-condition Bowens Illumitran that I might part with, if I knew it was getting a good home. d8-)