Actually Craig Wright claimed to have done this.

But Craig Wright is a prolific liar.

"“And I couldn’t cheat. You can’t go out and buy a chisel. You have to build the tools. And you can’t start by building iron tools. To make them you need copper tools. And for copper tools you need stone tools.” He spent years on it, even building his own kiln to make the graphite. In he end, he made five pencils that cost him more than $1200 each. “That’s probably another reason I got divorced.”"