The only reason I would ever scan a tranny is to post it on line. I don't know why anyone would take the quality of a slide and routinely degrade it thru the limits of d*&%$@l technology. The quality of the projected image was always disappointing, too. My 35mm's get viewed directly in an old Pana-Vue Bi-lens viewer. It's like being there looking right at the scene. Medium format gets put on a light table and viewed thru a magnifying visor.
Tranny's should be viewed directly with transmitted light. They really come alive, and nothing can compare.
I have often thought of co-opting the optics of a DLT TV, as those are essentially slide projectors. Too many projects on the list, though.