I started his autobiography last night. I got 23 dense and scattered pages in before calling it a night. I'd call him an INTJ with mild Paranoid Schizophrenia. He's more interested in machines and objective facts than people, so he's most probably a T. He was practically phobic of people, so that puts him as an I. The way he describes his inventing process is not actually very detail-oriented. He gets the concept first and then the details fill themselves in.
It's a really interesting, if difficult to follow piece. He wasn't as great at writing as he was at science.