This board is a small sample size, but it is probably enough of a sample size that when the next batch is built, we will hear it here first.
On someone's recommendation, I cruised Youtube fo Tesla factory videos. Its really worth a watch, IMO, just for the sheer scale of what it takes to put a car together. In particular, there is a video fo Elon himself walking through the factory with the youtuber and its astonishing how much detail Musk knows, and you can see all of the thousands and thousands of parts in the factory.
Frankly, its astonishing that they get any built at all. Also, it explains why you could be selling cars like crazy and somehow lose money as a company. The fixed costs are so incredibly high, and the possiblity of delay is also so high, that it becomes clear.
In one section, after seeing these incredible robots, Musk mentions something to the effect of "yeah, its great, but if one of them freezes at 2:00 a.m., shutting down the line, first its an emergency call to the elite robot engineeing team, and the next thing you know I'm flying back from Germany."
One surprise is that the color is chosen first. I guess its obvious but the cars are fully painted and then move through the assembly line.
But one thing is clear, its that if they had to choose, they would rather do two models, a SR+, and an LR AWD, than three or four. The LR RWD is different enough (essentially you need a completey different battery pack/engine set up ready at the point where the battery pack is joined to the rest of the car) that you can't really easily switch back and forth. Plus, the dash/control panel is installed as a unit, and that would be slightly different for a RWD vs. a AWD.