A little to much going on in this story I think. Try to keep it simple. I like the idea of Gorgans, but the Tyranids don't really fit. If they invaded the system then they would either kill everything or be destroyed. It wouldn't take long for one or the other to happen either. My biggest problem with the story is if the super humans were implated with anything xenos they would never become a chapter and would be hunted forever by the Inquistion. I like the basic Idea but it is over complicated.