Depending how much of this you are going to see in your animation is always a good way to begin optimizing models. Basically dont create what you arent going to see. I wouldnt say youve wasted your time, but a Stardestroyer isnt a mass of different textures, at the end of the day, so Id be more open to what you can get away with. Unless of course you are trying to replicate it bit for bit.

Also may be worth doing some nice stills to post up so we can see

Cheers
Jay