cool, I tried something like that on a tutorial which 1/2 worked so I gave up and started work on my own ship which the knowledge I picked up in the tutorial...
ur saucer looks great, top marks
however I would say this, I imagin the poly count for the saucer is about 2-3k which isnt bad for that type of detail but it looks like you've used full spheres making the nav lights try to cut them un half so you have the top or bottom part of the sphere and then use that as the nav light, full spheres will bring your poly count sky high, its best to try and cut corners if its going to be in a game like SFC
good start so far