Although I'm responding to the first post I have read the entire thread and I would have to say it has to do with availability and size. I've always been interested in architecture and even thought of it as a vocation at one point. I've built a couple of these models now and I'm working on a third, as you know. I would love to see some famous buildings from Americana. I'd especially like to see a series of Frank Lloyd Wright buildings. I've looked in the Google Sketch-up Warehouse and even found a copy of Union Station St. Louis, which in a way looks like a German Castle, however, the space required to build something of that scale is prohibative. Building in a scale where you can see and identify the scale would be like building a 1/100 scale Aircraft Carrier. You'd need a rather large space to display it and there would have to be quite a few formers. There was a time when I would have liked to build a cityscape like those you see on Letterman, or Leno, but that would be daunting indeed. Having said all that, I would like to see more done.