There are organizations which can help you build intentional communities, and tell you of existing ones. I'm sure they're not 100% free of their enclosing nation-state, but many have a good deal of autonomy (or so I think). Try http://ic.org/ .
> It would be more honest if Hahnel had said "I believe that, given
> freedom from need, humans might respond in a selfless, cooperative
> way in constructing their society."
But that has a different meaning. In the quote above, he just said people make social relationships. Nothing about selflessness, unless I misread.
Personally, I don't think it's healthy or desirable to be selfless.
> How can we know the answer, until we actually try
> something?
Fully agreed. And even if we experiment, we wouldn't ever fully know.
Tayssir