Exactly my point, my friend... You bought the model, which means it's yours. Obviously, you can't resell it as yours or anything that would infringe upon copyrights, but seriously you can do whatever you want to it now! Adding some lights in post would be much easier than tweaking the actual geometry, in this case. If you add any Brycean lights to your scene it will certainly interfere with your lighting scheme, and most likely make the trees look silly. But you could use ranged lights, or spotlights to light the ships up a bit... Create a sphere, set it to "hidden", call it something like, "Light Target". Then put the sphere(s) where you want to shine lights. Make a spotlight, and set it to Track your null-sphere... Piece of cake!