i am a mustang 11 builder and pilot, and have thought over what I would like in my next project. improve visability-by ssitting ahead of the wing- reduce noise level- auto engine - and it boils down to two designs. a pusher design with tandem seating and twin booms to the tail. frontal area 28" x 42". engine hp. 300 at 500#engine wt. The other option was a tractor design with auto engine the same and frontal area 48" X 42". Engine behind the spar like P-39. Question is where the prop inefficiency of the pusher would be made up for by less frontal area. Or the tractor design would outperform the pusher. Can anyone give me their ideas on this ??