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.
I’m not USian but in Europe/Germany we have Freifunk and the DN42. I’m sure there will already be local initiatives if you are in a somewhat populated region. Hit up some hacker spaces or maker communities or even amateur radio people and somebody will probably point you into the right direction.