Well, Tesla buys their batteries from Panasonic. And the motor is a standard induction motor, not very different from what the actual (Nikolai) Tesla invented back in 1887. I agree that their control system is going to be fairly complicated, since induction motors require the AC frequency to be a function of the torque as well as the RPM.

But then most applications outside "quick 0-60 pure electric car" use brushless DC motors instead, where the controllers are simpler. Even the insane McLaren P1 hybrid, which eats Teslas for breakfast, uses a brushless DC motor. So I'm not sure there is as much of a market for Tesla's expertise as you'd think.