I think it would be nice to have a "hot hatch" type car to get the most out the amount of space in a smaller car. (OK, so I drive a VW Golf GTI and might be partial to that style). I am not suggesting it would have to be that boxy.
How about a mini model X (model MX?). It would have the same overall rounded shape to allow for the required headroom. The COG would still be low because of the large battery pack. The car could even have Falcon doors to cover both the front row and the second row of seats. This would take care of the 2-door problem
A rounded shape like the Model X with a shorter nose and extremely short overhangs would make for a compact car that still has enough interior space to be useful. We could have a two motor version to allow for better traction and efficiency. It would certainly not look like an old Buick...
If the Falcon doors are too inconvenient ,too expensive or too heavy, then at least use suicide door in the back.
BTW: I drive a two door car now and since it is mostly me driving the car, I really don't care about not having back doors. The larger doors are much easier to get in and out of except for in narrow spaces. I might have had people in the backseat 3 times since I bought the car 5 years ago. Nice to have the option though.
Even nicer if the back seats could move all the way back in case I have passengers and no luggage.
@VFX: Any chance for you to create a Mini Model X Image?