Many designs proposed for seasteading purposes suffer from the inconvenience of being suitable for calm waters close to the coast, but 
not for international waters, where waves, wind and current are bigger. But some lessons can be learned from these designs.
Some examples:
We include here one example: Flotel 92. This is a project of the 1980s from the old Spanish yard ASTANO, for a floating hotel with 1000 rooms. The main purpose of this design is to offer provisional accommodation to cities without enough hotel capacity when an important event is celebrated. In principle it was thought for events like the 1992 Summer Olympic Games celebrated in Barcelona, Spain.
You can pick up the full document here [google docs].
