The port is a large station for logistics and shipbuilding. It has twice an Outpost's hold, more facility and generator slots than an outpost, and a dock that takes ships up to a cruiser, so an excavator, a tanker, a hauler or a deep miner can unload and be repaired there.
A Constructor builds it from frames, panels, containers and concrete. It holds only a Dock, a Shipyard, an Assembler, a Smelter and a Fabricator. It cannot hold a Mixer or a Refinery, so it makes no concrete or fuel.