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I see a lot of people complaining that Hogwarts Castle isn't "minifig scale". But that's not totally true.
Just look at the great hall section. Now the roof length here is only 3 or 4 studs shorter than the roof length of the actual Great Hall set. A very small discrepancy in the end.
All you'd have to do is make some minor modifications to the inside furnishings and Hogwarts Castle can work just fine as "minifig scale".