Elon takes an active hand in all of the engineering discussions and contributes heavily to design deicions. Of course he doesn't write code or machine parts him

Elon takes an active hand in all of the engineering discussions and contributes heavily to design deicions. Of course he doesn't write code or machine parts himself, that would be a really poor use of his time-- that's what he's hired thousands of engineers for, so that he can be head engineer overseeing the countless moving parts involved in manufacturing both rockets and cars simultaneously.