Here are two .stl files I've prepared for printing the pictured models. I use them as a visual component during theorotical trainings. They've proved themselves very useful so far. The scales might be a little wack (I honestly don't remember if they are.), but you can just scale them down in your slicer.

Scale them down by the same factor if you want the size ratio in the picture.

Bulker.stl tug-Boat.stl