I would love to make Hogwarts in Minecraft, but I have no idea what the whole castle looks like, or where specific rooms are inside. I have seen plenty of angles of it, but what I would like is some sort of official layout or blueprint of the whole shebang. Does such a resource exist?
J.K. Rowling drew a basic layout of Hogwarts and its surrounding grounds:
I will see if I can find any other drawings having to do with Hogwarts specifically. I think the movies are really wonderful, and they have J.K. Rowling's input and approval, so using ideas from the movies should be within the spirit of canon, if not perfectly, technically canon. Sachin Shekhar has already mentioned the Order of the Phoenix video game; make sure you get another source or two verifying the game is based on official movie blueprints, as most movies have only partial sets and a lot of the Harry Potter movies are filmed in front of the green screen. Enjoy building Hogwarts!
Use official video game of Harry Potter & the Order of the Phoenix. It uses official movie blueprints, J.K. Rowling's drawings and books' descriptions to recreate known places of Hogwarts. Its not an action game. The main objective of game is to explore Hogwarts & follow story of movie/book. You can visit almost all parts of Hogwarts & stop to look around. You can use it to create Hogwarts in Minecraft.
You can actually buy a replica of the Marauder's Map.
This (in theory) provides a blueprint of Hogwarts. However according to the customer reviews, it does not provide a proper map, since major locations are missing.
Lego recently released a beautiful Hogwarts castle.
There is an excellent map that can be found at http://www.oddment-tweak.com/, that is very helpful in getting an idea as to how Hogwarts is laid out.