PS. When I make large structures, I make an "empty" outer shell, and then make seperate interiors. So to make this work, you could make an outer shell, with no details on the inside, and then seperate figures, and depending on what scene the person wants to make, he can just load that part of the castle. If you make the castle and the interiors you can actually make them "smart prop" to the correct location when the person loads them. I am busy making a sci-fi city, and the main veiw is large, but "hollow", with a low polygon count. The interior of each building is a seprate file, and can be loaded only when needed. That way the poly count is kept down without losing any detail.