OH! Now all makes sense... because that vanishing points are REALLY complex! I thought you worked with 3point-perspectives or something (I mean, just tracing it, not modeling the scene). This is great
This is exactly the kind of thing I'm trying to do with Sketchup. I want to start doing a graphic novel, but I hate drawing backgrounds. Using Sketchup in this fashion I can create components that can be made once and repeated however many times I need them.