The final 1/3 of the book would be an amazing role-playing scenario. When you think about it, it's almost designed that way. The underground area, the floaters, the various "classes" of people we meet, their interesting combinations...
Have you played Dungeons and Dragons? It's not supposed to be fun as a place to really live, living in a land harassed by monsters, demons, no security, etc. It's an interesting scenario to explore creativity and conflict in difficult situations.
