Well about 20 years ago Pratt & Whitney spent a lot of money trying to copy the Russian engine design for the RD-180.
They finally gave up.
So....here we are...
No problem, we will just call Pratt, er, not in that business any more. Well, call General Dynamics or Martin, er, not in that business any more. Well, call Aerojet, er, well, not in that business any more. Then call Hercules, they made some I think, er, well, not interested. Call Redstone Arsenal, er, they are now a museum and finding those engineers who lost their homes during the cut backs may be a tad difficult also. Er, well, we can call ah, well, anyone consider using the blow gun approach to launching materials into space??