TWIN FUSELAGE C-5 FOR LAUNCHING THE SPACE SHUTTLE

There was a Navy proposal for a nuclear powered seaplane variant of the C-5. A twin fuselage nuclear powered turbo-ramjet seaplane could have been used by the military to launch the shuttle out in the Pacific. I am wondering if the high wing could have taken the stress of re-entry. The lift vehicle would be going to at least 140,000 feet. The low wing of the 747 makes it more like a lifting body. Which could help when the booster returns to earth. This is if the military went this way at all. The stealth Blackbird was clearly being developed for space application. The M-21 version was a two stage spacecraft. It had to be two stage because the early Rover engines had large cores and their radiation would have been a problem for the pilots. So, the "drone" was really a nuclear rocket engine that would take the Blackbird into orbit. Once in orbit the the D-21 rocket engine would return to earth for reuse. This means that the pilot would be exposed to radiation for the brief period going from 140,000 feet to low Earth orbit 60 to 100 miles.