Hi again Cessa1975, thanks for the translation, it's good (I'm french)
For the Hogwarts project, the most difficult is to match the outside with the inside. A long time ago, I tried to build it on another game (Minecraft) but I abandoned after finishing the Great Hall. But I know one thing: the interior (movies 1-6) is the first version of the castle (movies 1 and 2), so it's probably the best choice. Or, there is another solution to explore more details: the Harry Potter 6 "game" from EA (personally, I don't call that a game, but an "Hogwarts visit simulator" ^^) can be downloaded for free via any torrent or other platforms (or bought, but not worth it for that).
The other difficulty will be to build the circular towers and their roofs.
Hope to see your Hogwarts finished one day