It may take a long time, but I really feel the community aspect and what holds that group together is the biggest part of the puzzle.
I'll second that. I've never lived IN an international community, but I have lived AT a monastery, as a caretaker. So I've done a lot of reading, and I've got a little first-hand
experience.
The personal stuff is almost the ONLY thing that matters. Think about this. What's going to blow up your plans and make members leave?
Is anybody going to say, "OK, that damn raccoon ate six more of my hens last night. F*** all y'all, I'm leaving." ?
Of course not. All of the practical aspects, people just cope with.
What drives people off is when they feel like they don't belong, like they're being used, like they're not appreciated, like it's not as promised, or a bunch of other "feels likes." That's what makes people decide they've got to change everything, they can't keep going like this.
So I'd say, if that's the area that's going to sink your plans, then that's the area that deserves your attention and energy.
There are lots of ways to pull this off. The successful ones I can think of involve a single authority figure, but I don't know if that's universally necessary.
Best of luck!