MartinScorpio
Member
The door openings are the wrong shape, and you'll have to add a substantial crossbeam at the a-pillars to support the rear of he new smaller windshield. That'd change the way the car behaves in a crash, as would the roof panel inserts and new hinges/fastening systems.
You'd reduce the redesign work with your approach, but not the testing requirements - and you'd keep the existing heavy H truss, so it'd be heavier than it needs to be. I really can't see Tesla doing it.
Both the Citroen C4 Picasso and the Opel Zafira have Parabolic Front Windscreens as options. So we have precedent ;-)