One fighter design that I’d love to see authentic blueprints of is the McDonnell XP-67. Ahead of its time aerodynamically, it suffered from underwhelming engines and came just too late… right at the beginning of the jet age. I’ve heard rumors of jet-powered variant designs, but I’ve never seen any verifiable drawings of such a thing. In lieu of official diagrams, these are the best I have… drawings produced for magazines by non-McDonnell artists. The sources on both of these are unknown to me, but they probably date from the 1950’s. Bjorn Karlstrom, one of the artists, was a designer for Saab, and drew aircraft for magazines starting in the late 1930’s.
A one-sheet XP-67 diagram:
And a three-sheet series: