Aliens are a really cool Sci-Fi Catergorised Theme. Sci-Fi would definitely look cool with Cowboy especially in a game like Ol'West. Where there will be a chance to bring in some semi-futuristic items and cool hats. I don't know if it's a good idea but it seems pretty cool to me. It could add some of the stuff that Classic could have added with the Rocketship thing. I suggest a UFO crash site at the Native Indian side where it can bring a reason for people to actually go to the Indian Side which is usually pretty boring.