Well, the difference here is...I could probably build an experimental version of my proposal....mostly from a junkyard Prius.
The end result of your level of high-performance would be the HP of the powerplant, none of which has to weigh very much (another efficiency factor)
After all, the main power source for the propulsion motor would be the turbo-powerplant...not the batteries. Just like a locomotive.
Cool. Where can I get one.:)