By default all Water is marked as collision, so NPC won't wander into it, so I'd have to remove the collision area when placing the dock.
I think the Airship idea is better.
That only requires a building placement to check for any viable land, and I can make it passable to let Goblins walk on it, instead of making a way of removing the inpassability of water.
Problem with the Airship idea though, if I don't make it so it can land it's going to have to sit in the air and it might look weird or obscure the players view (like clouds do)
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