Would Richard Mathis' Coyote be considered legal for P-40? The fuselage meets the definition of profile by being 1/2" thick at the trailing edge of the wing, but it has 1" thick doublers on both sides at the front. Also, the P-40 rules I found state the "engine must be fully exposed from lugs to plug" and the outboard doubler covers the engine lugs, although they are visible from the side of the plane.
cheers,
Ken