I currently live on a 100+ acre farm with half of my family living on it right now. We already have 1 windmill up and I'm working on the second one so it can go up this summer. Water storage is already in progress. 175w solar panels are going up end of summer. We have ponds, creeks, shooting range(s), woods, deer, turkey, ducks, bass, bluegill, goats, honeybees, apple orchard, gardens, national forests surrounding us and are 5 miles from the lake. Riding atv's all over the place, drinking beer and shooting guns (lol) is my idea of a good time (hey, its kentucky!). All is good on the farm.
Now, for your idea of starting an off grid community for like minded folks. This is the trickly part. I would do this in a heartbeat, but as with anyone, the best neighbor is a fence as the saying says. Even with family, you can have your disagreements with them sometimes as others can validate this for me. I would be assuming you are selling lots to the other members of the off grid tie? Some other things to think of is if someone isn't pulling their weight in the community. What would you do then, and what would you do if it was a family member?
Just some thoughts, but I'm anxious to hear what you had in mind. It could even be setup like a regulated subdivision with restrictions, duties and lot responsibilities for each person. Some would even go to where they are paying a co-op fee and the moneies being submited to the community (extra solar panels, deep cell batteries, garden seeds, fertilizer etc). Just a thought and awesome thread you started!