I would try to make a Watchmen movie that is 3 hours and 30 mins. I would stick to the book and set it in the same time period. Yet I would try to exclude some of the small things but try to even include the things in between the chapters. I would try to get a budget about close to 175 million. As for the actors, I'd cast Edward Norton as Rorschach, Sam Rockwell/John Cuscack for Niteowl 2, Kate Beckinsale for Silk Spectre 2, Gerald Butler as Doc Mahanttan, Brad Pitt as Ozymandias, Ron Perlman as The Comedian. That would be the main cast. Have a score by Hans Zimmer and James Newton Howard. I'd try to build as many sets as possible but use cgi for some of the mars scenes. Plus I make it r rated and try to make posters for all the main characters.