a football field is roughly 3 acres so that should give you a an idea of scope...which is pretty big...thinking out loud i wondering the size of gringotts?I just did a quick estimate on the size of the show building for the simulator ride shown in the leaked blueprints. One of the plans does appear to have a scale on it but the numbers are to small to read, so I am estimating the scale from the size of a single door which would normally by 36" wide. Based on that the show building is roughly 336' square which would be 2.6 acres.