When considering the economic flexibility and “freedom” created by mobile settlements, we might look to the avante-garde Walking City concept from architect Ron Herron of the Archigram group as an example. Ron’s concept is something that has been in the mind of the architects for a long time.
Therefore, although this is not a proposal for a floating city, the mobile structures share the same concepts as a moving city like a seastead as they are autonomous and self-sufficient, they can interact with other moving cities, and they operate in a world where no boundaries exist. "Walking City imagines a future in which borders and boundaries are abandoned in favor of a nomadic lifestyle among groups of people worldwide."
More info can be found at the official website of the University of Westminster, here.
A Youtube video about the project can be viewed here.