Hmm, I think Level arrangement might be good, but also take it with a grain of salt because I'm not a native english speaker! I think my main confusion came from the way exits are used both as "real" exits from the dungeon and at the same time exits between the grid elements. (Plus the plugin parameters have "main exits" in the Region Id settings but those aren't explained anywhere on the blog as far as I can find.) The role of the different types of snippets and snippet maps is not super well explained on the blog, so in combination with the exits setup, that's where a lot of the guessing comes from I think.
I figured out how it works now, but I'm also not really sure how I would go about explaining it to someone else in a way that's easier to understand...