Here is more information on what to expect in the possible construction of these:

Not only would floating cities with some degree of independence lend themselves to these ideals, but the Seasteading Institute argues that they could create more innovative start-up governments unlike what it calls the “monopolies” of today. Now, it argues, individuals are born arbitrarily into states created by past wars and cannot change the government to which they are affiliated without leaving their home. Floating city-states, however, would allow individuals to sail their home to a new colony if they disagreed with the way a government was operating.

They make a good case and I look forward to hearing more from them.

Here is an intro to the video below we hope you enjoy:

Is seasteading the wave of the future? Joe Quirk of the Seasteading Institute thinks floating cities will allow micro nations to compete for people — providing better life options and innovations. “Aquapreneurs,” says Quirk, can save humanity from disease, environmental harm and maybe even war.

thanks to gizmag for the great info