When you’re writing stories like these, I think you’ve only got two basic building blocks. You’ve got the plot of the story, and you’ve got the ideas the story is driving at. Usually the plot is the easy part. You do whatever research you can, you talk to lots of people, and you figure out what happened. It’s the ideas that kill you. What’s the story mean? What bigger truth about all of us does it point to? You can knock your head against the wall for days thinking that through.