How many edges were used in the cylinder to create the saucer (I'm assuming that a cylinder was used)? The saucer is already "smoothed out" and those edges won't disappear. I don't think it looks bad, especially for an in-game model (and most of my saucer sections are worse), but if you want it smoother, the only way to do it is to rebuild the saucer, which doesn't look like it would be too difficult since every major section of the ship is it's own object right now. I also agree about the impulse engines. They need work. Overall, this model is looking really good. Can we see it with the edges highlighted or maybe as a wireframe?