The fly-back booster, F-1 (?), was to be a saturn five first stage with nose cone, wings, jets and landing gear. Advertised as just a standard first stage to be constructed with exsisting forms and tools, I really don't see how it could of been used repeatly.
Interesting thing about the russian buran - snow flake (?) - shuttle is that it was designed to be flown by ground control, if a crew wasn't required in orbit. Delivery runs.