Docks
The ultimate goal of seasteading is to create communities in international waters with a high degree of self-sufficiency, but this not an easy first step in colonizing this new frontier. Sea steads close to shore are being pursued as a more manageable way to develop technology, infrastructure, and awareness for this [hopefully] budding industry. Early adopters will have to rely on the shore for the vast majority of their goods and services, and the interface between the two should facilitate as free a flow of commerce as possible.