I've written a little about "weasels" (Weakly State Like Entities) -- think Disneyland and Burning Man. I think the world is already full of things which do most of what micronations or network states aspire to. Activists who want to build something in this domain should be looking at buying a casino complex near an airport and redoing the decor and values more than buying land.
It's all about licensing and social norms in the end.