Elon Musk wanted to create the factory of the future. But some Tesla workers say the car plant was better when Toyota and GM ran it 20 years ago. (TSLA)

· Tesla has pushed the boundaries of electric-vehicle engineering and technology, but it has struggled with manufacturing.
· Interviews with 42 current and former Tesla employees depicted the company as one that has cared more about production numbers and engineering than quality and safety.
· Some of those employees said...