Think this is the idea behind the GM Ultium platform (and probably others). They always held out “skateboard” as the goal, although I don’t know if that’s still a thing. Create essentially wheels and a plank that include all the power and drive components, modify to a small set of sizes, and crank them out by the millions. Then each car is a unique body and interior on top of the “skateboard”. As the platform gets to scale, you can drive the cost down, while still making unique cars on top of it - including low end cars