If you don't mind my asking, who buys stuff like this? A museum? To me, the whole joy of Lego is the creative process and the building of it, as well as being able to share and enjoy the work of your labors with others, both online and at conventions. I don't understand why someone would buy a massive castle just to keep it in their basement to play "medieval house" with.
That said, I'd love to see pictures of the entire layout to date.