There has been a terrible war. The world is falling apart in places, literally dissasociating molecularly and there is just a gray mist where the world is gone. There is a hint that machines are locally holding together pockets of the world.
In the novel, rich people maybe living in cities live a very oppulent lifestyle. They clone midgets and fight them or other clones like galdiators. I remember a sister and brother with a hinted incestuous relationship. Clonal Elvis and Lord Byron are also present at some sort of feast in one scene. The Lead character might be called "Billy". In one of the final scenes, I think there is a part about some lost technology that fabricates anything that led to a huge, past war. I think book could have been written in the 1970s-1980s?
I remember all of this in snippets but some of the images from this novel have really stayed with me and I'd love to identify the book. I read it around 2002 and I recall it was a hard cover book I checked out from the library. I can't remember much else.