The amazing stories of those who we call "The Greatest Generation" truly tell it like it really was, during the day. Sad to say but cooperation, planning, and execution like this is pretty much a done deal. You couldn't get an assembly line to do 1/10th of the Willow Run production in modern times.
It's a good thing they started building Willow Run in the 1930s, it's quite obvious that somebody, had a CLUE!
Enjoy!