Here in San Diego, California we have Camp Pendleton, the Coronado Naval Base, and the Mirimar Marine Air Corps Station all with cake-delivery distance, so this is my second naval ship finished in modeling chocolate.
The trick to rendering something in cake that is industrial-looking and loaded with detail is to break it down to the sum of its most basic reoccurring geometrical shapes:
The above circles, squares, cylinders, and rings, were all cut or punched out with small cutters from grayscale tones of modeling chocolate. The below propellors and deck pieces for the control tower were formed out of gumpaste and allowed to dry overnight. A lollypop stick, the only non-food element of this cake, served as the vertical tower piece and is what was used to preform the holes in the deck pieces.
Geometrical shapes can be paired or combined with piped chocolate in various colors to represent buoys, engine parts, turbines, deck lights, etc.
Even the most basic shapes, when manipulated strategically, that can capture the essence of something extremely detailed: