Oh I could do a swappable size. It's never been hard to design "skins" for swappable size planes. I've done multiple versions of Viggens and the Storch.
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Really the hard part is getting them printed. Larger planes mean larger prints and that raises the cost beyond what most are willing to pay. You're probably looking at around at least $8 a linear foot for most folks to print the swappable size. What?$30 to cover a plane? I can build four "Old Crow" type Mustangs for that!
These new mini P51 and Corsair sizes allow printing of the skin pieces on common (read cheap) paper sizes. I think people would pay the $4 to have them printed and get their planes looking cool. I have seen several folks designing other warbirds for this size that I will be doing skins for, localfiend's Mighty Mini Mitsubishi A6M Zero to name one.
Do you have the files for the Viggen?