Old cartoon style ship,  added pic for scale and support settings
Printing tips:

1. modeled with the fins ti be press fitted (0.1 mm tolerance on all touching surfaces)
   the file “test fit fin” is just for that, recommended to print it and the body to make sure your tolerances are good and scale the fins according to your printer settings.
2. no need of supports for the window overhangs, but adaptive layer height is recommended  to improve overhangs. (or just lower layer for full model, but there is no real need for it)
3. to prevent the model from falling over during printing use brim and painted supports inside the fit slots. that way it is held in place and the interface is not visible later.

Any feedback is most welcome!