I wanted to make a point that inventors (who are generally N types) are also skilled with tools and mechanical stuff -- they have to be. But the way Tim works is clearly conceptual. And I would expect a Se to have more here-and-now concentration. This is why Tim needs Al, who is probably an ISFJ, and consequently, the ENTP's opposite.
He's a classic example of how ENTPs don't necessarily have to be well-rounded, broad-minded, or even intellectuals (which is more Ti aided by Ne). Tim seems very Ne aided by Ti, and he certainly demonstrates that N isn't about bookworm inclinations by itself, but the N certainly is about creativity as opposed to an S, who is more about common sense.