Next time I load up the game I'll make note of what I've already placed. This is going to be my nicer version of the island -- as if the main industry has partially shut down, due to some type of disaster, but most of the sims are still trying to keep what's left of their little community going. Alas, the small rail section of town had to shut down. I'm going to have to finish up so I can post pics. It's really been a kick.
Next I'll start a new save of the nice version and modify the lots for a more apocalyptic game.