I work at Target here in Dayton, Ohio, and we have started carrying an item that would work well for lighting up a model. It is a small plastic cone base with a bundle of fiber optic strands mounted in the base and they fan out like a willow tree. There must be a hundred strands, all lit form inside the base by 4 LED's. The strands are 10-12 inches long and the unit is powered by a small adapter.
All this for only $7.99! They come in silver, red and blue. The blue is perfect for spaceship lighting. They are on a back end cap in section 'C', over by the lamps.
Cheap and useful- love that Target. Just a quick heads up.