LOL.. Schmued was responsible for the basic engineering and inter-relationships of the various systems that went into the Pony; and had not much to do with the outward apperance. The form of the pony was truly a team effort.
Which brings us to the next myth:
Curtiss was so busy producing P-40's that they had no ability to build other aircraft. That is somewhat unfortunate for Curtiss, as they HAD a mostly completed design ready. I think it was the XP-46 or something like that (not sure about actual designation) The XP-46 (or whatever it was) featured much reduced drag than other fighters.
Either way, when North American decided to produce an entirely new fighter, they bought the design that Curtiss had been working on. The resulting XP-51 was NOT a direct copy of the Curtiss design, but the similarities in appearance are unmistakable.
Basically North American took the Curtiss design and improved it in every way, creating a completely new airplane in the process.
Nope. Read, and be educated.

"Another urban legend surrounding the Mustang is that it owed a great deal to the Curtiss XP-46 and, in fact, stole numerous design features from that fighter. It is true that the British had insisted that since NAA had no fighter experience they should secure all current data from Curtiss about both the P-40 and the XP-46. Although NAA did pay $56,000 to Curtiss for technical aerodynamic data on the XP-46, there was only a very broad resemblance between the XP-46 and the NA-73X. The Curtiss aircraft shared only a similar radiator/ oil-cooler configuration with the NA-73X, and did not have laminar flow wings. In point of fact, the development of the XP-46 lagged behind that of the NA-73X, and prototypes were not ready for flight until February of 1941. In addition, preliminary design of the NA-73X was completed before NAA gained access to the Curtiss material. It could even be argued that the XP-46 data was most useful to NAA in guiding them in what NOT to do. The NA-73X appears to owe virtually nothing to any previous fighter design."
Hehehhehe.. yah can't steal the pony's thunder.

Hang