The Daily Mail has published an article on floating nations. They must have read Sea Species. Here's the link:
It's architecturally much more posh than Kahchk Kihhim but not as independent and filled with only humans. Actually makes me feel quite prophetic. These people are not fleeing from an oppressive government but a tax haven, I think. I don't think it would survive in the open sea, so it would be in the shadow of land. Makes me wonder how it could be an independent nation because it would be in somebody's territorial waters. Oh well, the idea is great and looks like somebody is doing it!