Re: Cautious note understood…
Shuttle build and tech was late 70's/early 80's.
With the advances in materials science over the last 3 decades, A Shuttle 2 built today would be far better made, more re-usable, cheaper, more efficient etc.
Comparing the Space X F9 with the 135 mission, stopped in 2011 Space Shuttle programme, is like comparing a Tesla Model S with a Shelby Cobra.