Okay, we've got the body of the ship ready. Let's move on to the second biggest part — the engines:
1. Pick the Sweep3D tool.
2. Open the Tool | Initialize subpalette.
3. In the Initialize settings, we can find a curve named S Profile, which stands for sweep profile. As its name says, this curve defines the profile of the mesh. We can alter the curve, as shown in the next image:
4. Create a curve with settings, as shown in the next screenshot:
5. You may want to save the Sweep3D tool separately, in case we need it again. Once appended, it loses its initial settings.
6. When done, append the engine to the ship and position it accordingly. Be careful to only position the engine, not to rotate it.
7. We'll have a lot of subtools, so it's a good idea to name them.
8. Our ship would now look like this: