https://buildyourowninter.net/ - simple, general instructions and a list of active networks
https://communitytechnology.github.io/ - more in-depth info
http://darknetmap.zone42.ca/ - place a pin to get in contact with other interested parties in your area!
https://roelof.info/projects/(2014)Pretty_Fly_For_A_Wifi/Pretty_Fly_For_A_Wi-Fi_booklet.pdf - #DIY upcycled antennae
https://solarflower.blogspot.com/2011/07/chicken-mesh-and-plywood-radiowifi.html - cheap, high-quality dish
Speaking of which, can someone with a twitter please get in touch with the buildyourowninter.net folks and tell them about http://vanmesh.net/
Sunbeam City is a Libertarian Socialist solarpunk instance. It is ran democratically by a cooperative of like-minded individuals.