Basically what I did was make three batches of Rice Krispies, and used the silhouette of Disney and formed it until it looked like the castle.
I used melted chocolate to give it a layered look. Rice Krispies form pretty easily if made exactly to the normal recipe.
3 Tablespoons butter melted
4 cups small marshmallows melted with butter
6 cups Rice Krispies
Make sure whatever container you use to form the shapes you push everything down thoroughly so it forms into the desired shape, this way it won't fall apart.
Enjoy experimenting designs for yourself.