Actually, there is already rast2 article: https://magcius.github.io/xplain/article/rast2.html. Also there is the menu article: https://magcius.github.io/xplain/article/menu.html.

FYI, these are unfinished, and I have no plans to work on this series again.

Unfortunately, repository https://github.com/magcius/xplain is archived and the latest update is from 5 years ago.