I built this with my two 6 year olds. It was going to be one story. Every time we finished a floor, I asked them if they wanted to add another. The patios were their idea. The boy was also insistent on an elevator, which is what that hole on the left is the future site of. I have no idea how I'm going cram some kind of elevator in there. I just posted in a Minecraft thread asking this; but, if anyone has any links to elevator building info, I could use it. This is the first time using hinges to make a house that opens up. The kids love it. When we start building, they want to know what the "special feature" will be. "Okay, okay, you can bring it to the breakfast table."