Question pertaining to two-door design for the next version
I'm no car design expert but it has been suggested or implied that the reason Slate only went with 2-doors instead of four is because 4-doors would have increased the price (and possibly complexity) of the Slate and they wanted to keep costs down.
At the same time, some (not all) of those passing on the current first version of the Slate have stated they are doing so because of the lack of 4-doors (or, in essence, lack of easier access to and from the back seats of the SUV version).
Now if, in the future, Slate wanted to address the feedback of these potential buyers in the next design version of the Slate they would presumably create a version with 4-doors and, as a consequence, raise the price to accommodate the added two extra doors.
But I want to know is if it would be structurally sound and cost effective to instead not add two extra doors but simply elongate the existing two doors to accommodate the rear seats? So that when the doors were opened, full access to both the front and rear seats would be made available while keeping the Slate a 2-door. Obviously, that would require a bit more material for the doors to extend their length but two less latches and locking systems than would be necessary for a 4-door.
Is this a good idea or not recommended from a structural or cost effective standpoint?