Wildly ignorant choice. No one's going to sell a big enough battery without at least modeling its effect on crashworthiness, which is expensive. No, you can't run the car without the engine running; you won't have oil flow in the transmission, power steering, or power brakes. The car will handle like shit with so much unsprung weight (which is why no commercial car has ever used them, just demos). And the price quoted is basically COGS!
Nobody on this process must have ever been involved in DFM.
Nobody on this process must have ever been involved in DFM.