Normally you need a low voltage battery of some sort. You want the high voltage battery disconnected completely for various situations, but you want the rest of the vehicle electronics live to do troubleshooting, etc.
Most battery drain comes from some sort of software issue prohibiting a...
Yep. No grille needed, nothing of substance to cool up front. You want a smooth face for maximum aero. Just like no door handles for maximum aero. You don't play with millimeters of height to gain aero, then throw it away 10 times over on a grille and door handles...