I used this site for finding model ship plans that can be used to create a scaled ship in-game. I found if you just search “free model ship plans” or use google images for a specific ship you can find plans to use to create realistic/historically accurate ships. The plan i’m currently using is for The Galley Washington.

http://www.thenrg.org

If interested in creating ships like this, I suggest you use the method that MrBeasty127 uses as it works so well to get the basic proportions and scale correct.