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Whether something is in-house or external manufactured I think is determined by the relative investment required to be the #1 producer of that component.
Take BMW: what does bmw actually produce in-house vs. outsourced to a company outside the capital umbrella?
Engines, bodywork, painting, assembly..
outsource: nearly every component that is assembled into the car
Why engines produced by themselves, but very few other components?
Because engines are the largest, most expensive individual component - a start-up automaker buying engines from someone else, if they are successful, will eventually buy-out the engine maker or reproduce the process themselves, because the % business that the downstream (automaker) versus component maker (engine) is large - in other words, the engine maker is at the mercy of the automaker.
This is why low-production run/ marquee productions like Pagani use amg engines, because neither would produce a Zonda but themselves.
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