Was just looking though my copy of Building the P-51 Mustang, and it makes me wish I had those photos of the XP-51F/G and P-51H (including mock ups) in HQ, and the Schiffer book about the F-82 has some good mock up photos of the XP-82 that I also wish I had.
I'm guessing that Boeing have those photos and they probably won't give or sell to individuals.