Occlusion culling will be your Friend on something like that in Unity...your total ship may be 370k+ tris, but once you intelligently break up your model to make maximum use of occlusion culling, will make a massive difference.
Thanks for the comments guys! The sails aren't too special here is a shot. The textures are also very basic. Baked some probes, added some cannons and swivels as well! Don't mind the stats they as that is before batching and what not
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Whisky