Thanks! I used to come across unmaintained projects that I'd be willing to merge some PRs for (they'd usually have them pile up), that's how I came up with the idea.
I think most people expect that they'd add their project and get immediate help, when the project is more a backup plan to straight up abandoning a project. I think you're the first person other than me to get excited by it, so thanks!
I've already got a handful of projects I maintain, but I've got a little more bandwidth. I'll take a look at the list ;-)
Don't give up on that! Code Shelter will grow. We just need more awareness. I'll help with that.