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There seems to be a lot of doubling of the same texture with extremely minor detail changes. Have you thought of overlapping those those UV? This could give you a lot more area to work with giving you more resolution over all. It seems your ship you basically be cut in half and you could just minor the UV's. The variation between each half is so minimal that it would almost be foolish to give each side its own space on the texture.
Now with the gun on the bottom the right and left texture are clearly different so having each side works. Unless you deiced to push the both sides dramatically different I think you should look into mirroring the UV's. Even if you wanted to have some thing very distinct on one side like a logo that could easily be done using a decal while still having the main portion mirrored.
Like the look of the ship though
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