Wow! Just now found this topic discussion while doing research for another member. Very interesting! The P-51D alluded to, Happy Jack's Go Buggy, is based here in San Antonio, where I live and I get to see and hear her all the time! Very interesting that some flying examples still use the fuselage tank, which caused serious cg problems when full, and IIRC, any maneuvering was prohibited until a good amount had been used out of that tank. I have seen the tanks and plumbing that are on HJGB, and they are very true to the original and function. I hope my fellow Mustang Maniacs will find this post of interest.
Mike
https://a2asimulations.com/forum/viewtopic.php?f=93&t=49064