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 more manageable way to develop technology, infrastructure, and awareness for [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.