[panick21_]

Sure you always learn something when you do anything.

> Literally can’t build an F-1 engine.

We can. There has been lots of work done on that already. But you wouldn't want to do an engine like it was done back then anyway. It would be crazy to do it the same way. A modern version would be better, better controls, lighter and so on.

> However, the benefit is that we would then have plans (diagrams, specs, etc) to build it and one built we can iterate.

Those would be more like constraints. So many things that are not the same anymore. You would literally reconstruct the economy from the 1960s first. That would be totally insane thing to do.

Its not because of 'lost knowlage' its because first of all, it just doesn't make any sense to do it the same way even if you could. Both the tools and the people are totally different, the structure of the economy is different.