Yes Steve. As it stands it will take Type 100 pack film and 120 rollfilm (up to 6x9). But without too much work a 545 Polaroid back can be adapted, or you can use a ready adapted NPC back for 4x5. Admittedly not with full coverage, but the opening in the baffle halfway through the body can be widened, no problem. Exactly why it's there at all is a mystery. The body is cast in one piece and tough as nails.
The good thing about the 600SE system is that is so extensive. Extension tubes to the rear for macro, all sorts of 120 backs, finders (ground glass, 45 degr reflex) etc etc. The list goes on.
Are the 600se and the mamiya clone basically interchangeable? Or is one better for some reason,