I saw your idea on a sci fi writer's forum and thought it was interesting. I did notice that others were not so nice in their assessment of your idea. I'm hoping that did not put you off the idea. It is a creative idea that is used by some very popular authors. They get two or three writers to author one book and sell it on the basis of the most popular author's reputation. I don't see why this couldn't be done by amateurs, it may lead to something big. And even if it is a complete bust, it would be a great exercise.