Ah, yes. I daydream of the same thing.
Dunbar's number suggest optimal population, though it is a soft number, people have children, and you want to be able to host people so that they can learn how to do this stuff and go replicate it. Meanwhile, if you've been listening to Paul Wheaton, at all, you'll know one of the things he wants to be able to do is have people come to his place so that they can eat well and heal. This presents an interesting problem. Much like people move out of California due to high taxes, only to recreate a miniature version of West Coast hell in adjacent places, it is entirely possible for broken people to break whatever you've got going. So, you've got to have a solid core of people who are healthy and productive. Here is an interesting suggestion about the value of networks. If you take that with Dunbar's number, it probably makes sense to aim for a hundred people, especially if I'm right and n(log)n maps levels of specialization. So, seems crazy so far, right? Well not really, because if you research permaculture at all, you'll find out they can do amazing things with nature, but when they add people, things get really screwed up.
The best current legal setup I can think of right now would be an L3C. A lot of permaculture people seem to hate corporate structure, but an old fashioned version would serve very well. If your stock was basically the deed to your land, you'd have the incentive to vote (or let a CEO run the place) in ways that improves the whole place. One of the reasons corporations can be very bad now is that people have incentive to manipulate the stock price without regard to the long term value of the underlying business. Nobody will do that if they know they will be reducing their own property values. The incentives of a consensus model seem to be take everything and cry when people say no to you. Finally, I am looking forward to reading Kevin Carson's book The Homebrew Industrial Revolution. It sounds like he is exploring the implications of being able to return to home production of most things thanks to technological innovation. I've heard him a few times and he seems enthusiastic about permaculture as well.

May be worth spending some time in the Findhorn Community & the adjacent (& smaller) Woodhead Community in NE Scotland. I lived in Findhorn for 7 years & they have a lot of folk there wih LOTS of experience in starting/growing intetnional communities/co-housing.

http://www.diggersanddreamers.org.uk/index.php?fld=initial&val=W&one=dat&two=det&sel=woodhead

You may also find Joel Salatin's Polyface Farms organisational structure/farming methods helpful.

With the aim of developing a coherent theory, replicable template, and physical example for this, there's the Intentional Paleo Community group on Facebook. I'm not sure arranging a "paleo community" around abstracted capital and agricultural-state conceptions of land rights is any more consistent with "paleo" than grains, but I suppose that's a bigger conversation.

I have heard that it could be similar to this: http://en.wikipedia.org/wiki/Kibbutz

Dragon's Eye on the Big Island of Hawaii. http://dragonseyecenter.org/home/Welcome.html

Besides them there are a couple others on the Big Island that are paleo/WAP inspired. Belly Acres comes to mind as well.

Move to a small rural county in AR. :) Seriously the people there already live a subsistence lifestyle, they grow their own fruits and vegetables, they raise meat mainly on grass and they hunt and fish regularly to stock their freezers. The only difference between you and them will be you don't eat any grains or processed stuff. It takes a bit to integrate into the community but once they know you are there to stay and you aren't there to try and turn their rural heaven into the suburban hell you just came from they will like you just fine.