Love the Tufte style. One real limitation, however, is the "mobile view" in which the margin notes collapse into clickable superscript numbers. I don't think it's clear to most readers that one is supposed to click on those to expand them, meaning they aren't likely read by perhaps 50% of your readers. One thing I've seen, and adapted for my own site [1], is inserting these margin notes beneath the paragraph in mobile mode; this way, the notes do not go unread.