and the body can't act as a giant capacitor because it would guarantee the car would explode spectacularly if it ever hit something with enough force to compromise the body panels :-)

I think some designer pooped, err popped, out this 'look' and said "Ohh, I love how futuristic this looks!" let's have a thought shower on how many amazing technologies it might contain without constraining ourselves to reality.

Generally such exercises are useful for helping engineers think outside their generally conservative and self imposed parameters. Even when the actual concept is not really a viable design.