I've never seen a kit before, although that doesn't mean one doesn't exist. Would be cool to have.
I have seen some scratch built ones before.
That or even one of the smaller alien ships would be a nice model to have.
889. "City Destroyer" spaceship filming miniature from Independence Day. (TCF, 1996) The most iconic sequences in this modern sci-fi classic are those of the colossal saucer-shaped "City Destroyer" spacecraft hovering above The White House, the Empire State Building and other Earth landmarks...