Don, the floor on a 47 canted up a few degrees at the cargo door so as to be parallel with the ground, but the 3's ran straight. Then there is the baggage door aft of the main door, no astrodome and the tail stinger is present on the 3. I converted an ESCI kit a while back and these are just a few things I remember. I had to put Wrights on that one as well, stole the cowls from a B-17 kit!