Uh.
My hobby is metal machining. Precision is a matter of understanding the physics of what you're doing, knowing your machines, and, well, the machines.
I can give you close to 0.0001 tolerances with the machine in my apartment (about 6-7 times better than stock cheap mills that haven't been properly tuned, depending on the material). Use a big, rigid, production-oriented machining center built for it, and you can do better.
I can't build you a car, though. Precision has nothing to do with this.
> But Apple could easily hire 10-20 people from car industry to fill the missing gap and get there in 5-6 years.
Something tells me you haven't been part of a project that involved mass production, complex engineering (not software-engineering; engineering), or regulatory compliance.
If I were to guess, I'd say Apple has already hired at least 10-20 automotive industry lawyers, just to get moving on just the regulatory side of it.