I'm thrilled to see projects like this. I had a quick look myself last night, and it is a real gem, just his XF-91. Apart from my personal interest in 50s/60s era experimental aircraft, I'm thrilled there's still folks who are willing to make these off-the-beaten path creations, freeware, no less.
Rallymodeller, some repaints of this would be delightful. Would you consider either a mid 50s NACA or late 50s NASA flashed prototype? Something like the Douglas D-588-2, Bell X-2, or even the later XB-70 - would be a perfect guise for testing at Edwards ...
Thanks to Uenoshing for a great set of experimental aircraft. He's been working on these literally for years - they're worth a look.
dl