looks like a pretty sweet idea, but as it is i am already currently building hogwarts, and i plan on restarting hogwarts again in a new and lower location so i am able to build higher as well as fix some of the major flaws i created with the first one, and i have committed to helping 405 with the pentagon again cause i am a pretty quick builder....
I regrettably do not think i will have the time to help you out with your Coliseum.