You may notice a pair of short little fins, called strakes, just aft of the bridge bubble. If you do the 3D view and rotate the ship, you'll see another pair on the bottom of the saucer, and four more on the secondary hull. These strakes were hotly debated over on the SFB board. ADB / Steve Cole wanted some sort of distinctive feature to denote the model is an X-Tech ship. The plan is for all X-Tech ships of every empire to have strakes of some sort. Each empire will have slightly different designs, but the basic concept is the same. The initial Fed CX draft had really tall strakes, which looked like a tacked-on after thought. After some discussion and a few changes, the final version made them shorter and subtle, which look more integral / organic to the overall ship.