A) What has more complexity, Model 3 or Falcon 9?
B) What about the complexity of Model 3 including production vs. Falcon 9 including production?

By complexity I mean the time an imaginary person would need to understand all aspects of the product so he could build it himself and also further develop it. I guess the Merlin engine is much more complex than an electric motor, but with Model 3 you have to learn a lot about battery chemistry.