Using chocolate frosting, attach small cake piece to the end of the large cake on the platter. Using chocolate frosting, attach 2 large pieces of cake on top of each end of base cake. With a serrated knife, cut step from top layer of back end of ship to create third level of ship. With cake layers assembled, cut boat shape using our template below as a guide. Frost entire cake with chocolate buttercream. Using a small fork, gently score the entire cake with wavy lines to simulate wood.