All of our original designs were true 1/12 scale. The P-51 has a 37" wing span and the F8f has a 36 3/8" span. If you need them to be 40" I can rescale the plans to that but the fit of the stringers and ribs will need to be adjusted to fit the 1/8 x 1/4" stock. Not a big deal but something that will need to be addressed. I wI'll redraw them in the new scale in the future. As for the cowl and canopy parts , those will require new molding and that will take a lot of time and effort.