As to who designed this Warbird, it was my late good buddy, Mike Garmon. The P-51 was the first of the series. He also designed the Sea Hurricane, Me-109, FW 190, and the Zero. All of those use a shortened '57 Green Box Nobler wing. IIRC, Mike said he removed rib #1 and used #2 through the tip rib. I was fortunate to build the Zero Prototype, and it is the best flying profile I have ever had. Powered that one with an "OLD" (well used! LOL!!) O.S. .35S.
BIG Bear
RNMM/AMM