I’ve seen some resources floating around including, if I’m not mistaken, a spreadsheet that adds up all the costs of everything you need.
Basically I want to create an internet coop that’s resistant to internet shutdowns and can keep running in situations where the wider internet is shut down but we still have electricity.
Look at Reticulum, not an ISP but a network stack that runs on many different connections including LoRa. NomadNet is for markdown webpages and there are a few ways to message others.