I recall that Saturn went down a similar path (https://www.youtube.com/watch?v=FNrfqHaEeYg https://www.youtube.com/watch?v=FNrfqHaEeYg), where they manufactured

I recall that Saturn went down a similar path (https://www.youtube.com/watch?v=FNrfqHaEeYg https://www.youtube.com/watch?v=FNrfqHaEeYg), where they manufactured a lot of the components in house. I wonder how they managed to pull it off.