I think that would've been too complicated. You'd have a very tall show building atop the already massive FJ show building, meaning they would've had to enlarge the Hogwarts Castle façade by great means. Doing that also would've meant rearranging and rescaling the rest of the land, which would've been an unnecessary difficulty.It would have been cool if they built a Great Hall restaurant on the roof of the show building for FJ. Kind of hidden behind the castle facade or something. I have no idea if that's logistically possible but it could have been something different for our version.