It doesn't seem so tall when you realize everything will be buried up to like 4-5 feet around the site... Probably around that mid-cross beam along the wood there. That wall only comes up a couple feet off the ground then, and is pretty much even with the track (at least towards the far end to the middle).
EDIT: Buried around the site -or- filled in with water, as is the case to the left of this area.
Do you think the foundations will be filled around the outside with dirt or water up to the top of the concrete?
Could it be possible that any of the escape paths would be underground for a far better themed experience on ground level?