Great history on Seasteading from FreeCities -

https://free-cities.org/seasteading-the-movement-history-and-perspectives/

It's a long read but covers pretty much the whole of Seasteading history with tons of useful links to various projects. It also discusses the future plans of The Seasteading Institute, which have a lot to do with making legal a new categorization of sea-bound dwellings. (Instead of just flying a friendly country's flag.)