I run a Kawi Z1 ducktail on a 73 750. You have to make a seast and an inner fender piece.
as to what you mentioned, go for it.. nothing to loose.start of with cardboard templates taped together till you get your look.
I would like to recreate a Z-1 ducktail in Aluminum, partly to get a better fit to the frame, and because brushed or polished alloy would look nice..