Which wasn't such a great idea if you ask me. WHy bother with seats if they can just be bought from suppliers specializing in seats? Same for manufacturing. It puzzles me why Tesla did not outsource Model 3 production to a company like Magna or Valmet. Both of them are producing Mercedes, Ford, Porsche, Peugeot, Opel, BMW at a lot of others on the same assembly lines. And you can be sure that this production is running smoothly without a CEO living on the shop floor or meeting volume targets at the cost of quality. If that would be the case, these sub-contractors would be out of business already.