[Rjel]

I don't really get your fixation on the K. I'm not a self proclaimed expert, but as others point out the differences are so minimal as to be insignificant. I'd wager in a large production run like the Mustang you could find A/C from the same serial block with slightly better or worse performance.

As we already have the F-51D for Korean ops, why not make one with a fixed tail wheel? Most were locked into the down position in the 50s. That would be a valid reason to model your version.