Many people have made suggestions around upgrading the boat. So, I got to thinking, why stop there? How about a shipyard?
The shipyard could have 3 basic abilities: First, a mega fabricator/3D printer for making ship sections. Second, a bridge crane for moving those sections into a drydock. Third, the drydock for assembling or upgrading boats. This could be a great use for all those materials we have been collecting.
The shipyard could also serve as a home-base for people, preferably located near the center of the map. It could have a large internal space (with a door like the sanctuary docks) for supporting multiple boats. Also, a nice area on the roof for building a tree farm. A salt-water pump would be epic.
As for the ships you can build, I would suggest role-based:
