Not a community per se but I’ve found this website to be pretty great for getting ideas etc for various budgets and use cases. Full disclosure, I’ve never dug into any background on the site owners etc, so no idea if there terrible or whatever.

https://techbuyersguru.com/tbg-diy-pc-build-guides/?filterstate=off

I too am considering a framework 13, and am wondering the same. Hopefully someone will give some insight.