I'm thinking that I might get a second bathroom set for the external build to place down under the fluffy set. Will then attach some vine parts from the roof under the trap door for the devils snare. Underneath I will add a "Queen minifigure on a 6x6 black and white grid and use the external build of the toilet to moc a chamber of winged keys. My thought is that it will be very, very similar in layout to the original Chamber of Winged Keys set. Not quite in movie order, but will be very nostalgic for the old set. The bathroom exterior will be much more visually appealing at the bottom than lockharts classroom and you can then keep the classroom up the top.
In my mind this seems perfect and should be very easy to achieve.
I must admit I am highly surprised how many people like the chess set. Personally I think it is one of the most ugliest LEGO sets i've ever seen! The Chess pieces are the most awful cobbled together garbage i've ever seen. Also the Knights WILL fall apart. The are held together by one measly stud! Going to be worse than Unikitty from LEGO movie. You touch them and their head fall off.
Chess thoughts is personal opinion. Happy for those who see this differently.