A simple command was posted in /cuckquean/'s bunker that I adapted to save all of /monster/'s threads, albeit text-only. This will help you grab CYOAs, greentext threads, and all the other stuff you forgot about, albeit without images or thumbnails. All CSS and other rendering is preserved and saved directly to disk with all links changed to reference the on-disk location.

You'll need wget in Linux, macOS via Homebrew, or Windows via Cygwin, change to a new empty directory, then run the command below. Note that this goes via clearnet without HTTPS, so make sure you're behind a VPN if you give a fuck.

wget -r --level=1 -k -p --include-directories=monster,js,static,stylesheets,inc http://206.223.147.217/monster/catalog.html

Once your download is completely finished, all links on the pages will be rewritten to point at your on-disk copy. Open catalog.html and click through to each thread as you please. When 8chan comes up properly, the command can be adapted to save thumbnails and images also (if you have the disk space of course).

Hope this helps.