This was a pleasant surprise to find my own site on HN this morning! I wondered why it was getting a few more FB likes than usual today.
I'm happy to answer any questions.
I finished this redesign last week so any feedback is welcome.
The main task was to recreate labels and annotations on the illustrations in SVG format, and to reformat the articles in a way that flows nicely and is responsive, but without needing complex markup in the articles. I'll write about the process if there's interest.
I've previously written a little about this project:
http://www.howacarworks.com/about/making
http://www.howacarworks.com/a-year-on
Current traffic is 200k uniques a month and it's taken about two years of steady growth to reach that point.