As ship modeling coordinator, I'm going to ask you to stick to the windmill for now. That's not to say you won't be able to build a ship at some point in the future, but it's important to start with smaller, more manageable projects, and also to stick to what one starts. Ships are massive undertakings that require quite a bit of experience and time to build. Also, Buildings/machinery and general game world assets are very much needed right now. You're doing quite well with your current project, and I can see you're learning fast, can't wait to see the finished product!