Try to bring the spherical objects on the thing to resemble a geosphere wireframe (also, you can safely kill some of the round segments on the bottom sec hull dome with it too, it won't take away from how it looks and you will save polies). Also, look out where you will have symmetrical detail and where not, and only kill the symmetry lines where you don't need them (will help you loads when mapping). I did basically the same thing with the Galor/Keldon I did for Excal, all the polies which have asymmetrical detailing are mapped as such, the rest was mapped with symmetry modifiers over the unwraps in the stack.
