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This is from 2012, but I thought it was worth a look. It is absolutely amazing. I have been working on my Harry Potter minifigure collection and I noticed this post in my research. I currently have about 75 of the approximately 133 figures in the Harry Potter line. I still have a lot to go.
You can see them all here.
http://www.minifigpriceguide.com/HARRYPOTTER.0.html
Holy Cow. This was created by one individual at home. I wonder how long it took and how much it cost.
This may be the best home build that I have ever seen.
You can see more images over at Alice Finch Flickr Page
The interior is pretty detailed as well.
You can read more about this at the following locations.
http://www.buzzfeed.com/donnad/mom-single-handedly-builds-400000-piece-lego-hogwarts#.ve5aO6AXA
and