Offshore society

In the distant future, polar caps have melted and sea level has risen dramatically. Majority of earth was flooded. 
Rooftops of the major cities turned out to be safe havens, a fortresses against hostile environment. 
Dry land still exist, but It's ravaged by constant war between different factions. Majority of the survivors of this cataclysmic event, found that endless seas provide safety.
My entry for Kb3Dchallenge. Used post-apocalypse kitbash kit as a base and started building my own kb-pieces on top of it, quite literally.
Yes, heavily inspired by Waterworld