Every Rocketdyne engine was fine tuned and perfected by hand, from plans, that were modified but not updated. This means that each engine was unique. It would take trial and error to build them again.
With GIT and other forms of version control the entire process could theoretically have been logged and preserved, not so, in this context. Interesting video.
https://www.youtube.com/watch?v=ovD0aLdRUs0
I have not studied electronics but I have studied the Google IT support course among others so I have some basics of how computers and tech work. This type of documentary series is interesting because it brings history to life, and explains how things work. It is not sensationalist, does not use too much music and more. It just guides you through how technology works.
https://www.youtube.com/watch?v=v49ucdZcx9s
I was surprised to hear that transmission was as low as 2 watts and as high as just 11 watts.