This is a model of an Aircraft Carrier and it even floats. There is also a version with aircraft on it. The two lines on the deck of the ship are the runway for takeoff and landing. You can play with it at bathtime or in the sink. The two “boxes” on the side of the boat are mainly for balance. The mast on the boat could fail so if you don't want to have any drooping filament lines, you can download the no-mast version. 

There are some printing requirements for it to float upright (size: 200mm)

For the first 5 mm, print with 20% cubic infill, this is essential as it will act as a ballast to keep the boat from tipping over. After 5mm, you should print in 5% cubic infill for best performance during floating but you can experiment. You can also scale it up or down as you wish.

Enjoy Printing

If you want to edit the raw files, here is the Onshape Link:https://cad.onshape.com/documents/115d8137669785a463940d22/w/ca2dd3ea89aa3356702efd61/e/dff4b1169f491669f9a4a72f