I love this whole build, and I can't wait to see what it's like when it has all been finished with the common rooms, class rooms and everything else, especially the dungeons. There is just one thing that I didn't like, and that is that the writing in gold iron and diamond says "Harry Potter Hogwart yhnu481" whereas the school is called "Hogwarts" with the "s" on the end. Sorry to be picking up on small errors but I thought I should say it so it can be changed.
They did put up a download post on another site, called minecraftsandbox.com Its a few pages back. I downloaded it, but its hard to explore the castle in single player. Way to many monsters. I have been meaning to install it on my server, but haven't gotten around to it yet.