Use model for Colonizing Outer Space.
NASA is a good source on that, and it’s still a LONG way from being viable. Seasteading, on the other hand, has the benefit of not needing air supplies shipped in, or expensive construction to protect from the hazards of explosive decompression and radiation.
Rather than Space as a model, imho, seasteading needs to become the model to base space expansion on.
nailed it. the bigelow expandable modules could be used. the phase 1,2,3 can be used for spacesteading. the space colonization is about to get a blueprint from us