It would seem that Apple would outsource the actual manufacturing, since that’s what they do for all their other products.
re: design resources, I’m sure it would take thousands to design a car but really I have no idea. With your industry knowledge, do you think the 5,000 employees Apple currently has on the car project will be sufficient? Will they have to continue hiring?
Note that I didn't say anything about manufacturing, just only development (Styling, Design, Simulation, Test... all the steps necessary
before you start the production of the tools and assembly lines before you start building the very first car which will be sold), that is a huge effort not comparable to electronics.
According to wikipedia, Tesla has 35k employees total, for example, so 5k is not that big number. Only to develop the Software and Hardware (Sensors, Cams, etc) of an autonomous car? Probably yes, but for a full car? No, I don't think so.
Take
any car as example (don't forget it still must comply safety standards as any other car). Add Autonomous capabilities. Add Apple superlative Styling, Materials and Quality/Value perception (Prototyping, Testing, Manufacturing and Assembly tolerances that don't resemble electronics ones)...
I can't explain how complex it is. Safety alone as a non-autonomous car is already very difficult.
Yes, you can buy experienced people with expertise on developing cars, but each of them would have experience under different quality standards and I am sure Apple wouldn't make
just another car but a disruptive one. One that looks and feels from the year 2050 and seems its driven by magic...
I love Apple products and I would love to see it happening, but I am not sure it will be in 5 years time.
Apple's philosophy, in words of Jobs, was not to be the first but to do it right (IIRC)