I never had any formal training for these layer upon layer cakes and I know I was pushing it with this cake. I'm actually surprised knowing what I know now that it actually stayed standing!
I used malted milk balls to act as cannon balls and Rolos on the sides of the ship to act as cannons. It's hard to see in this picture but the bottom cake was started to push the filling out from the weight of the ship cake. Oh how I've learned along the years!