Yeah, you're working a little finer than I am. Drawing furniture full or half scale, I'm not too bothered by a thicker line as the pencil dulls. Drawing a graph, I'd probably want a more consistently fine line too.
I like the basic Pentel P205/207/209 pencils, but the basically disposable plastic Bics would probably be well suited to the short, brutal life they'd lead in the shop.
Loved the article and the joy of the process. The outcome is spectacular and shows the care that went into it.