I mean, if you go through the Apollo program contractors it's a who's who of aerospace. Boeing, North American Aviation, Grumman Aircraft, McDonnell Aircraft Corporation, Bell Aerosystems, Rocketdyne...
Electrical parts ran at aviation-standard 400hz. Aviation gyroscopes and aviation instruments. Structural parts made of aviation aluminum alloys. Astronauts that are all airplane test pilots. I can imagine doing Apollo from complete scratch (using car manufacturers that have to invent aluminum-handling tech starting from nothing) but it would have taken a lot more than the decade Apollo took.