Looks very good, I love the serif font!
I read the first article you mentioned and I am bookmarking the others for when I have more time
I read the first article you mentioned and I am bookmarking the others for when I have more time
The font is ET Book: https://edwardtufte.github.io/et-book/
I borrowed heavily from Tufte CSS: https://edwardtufte.github.io/tufte-css/