Me and my friends had this idea its just a big open map with a trench coverd with glass and spikes at the bottom here are some screenshots.
http://img132.exs.cx/img132/2269/pic28.jpg
http://img132.exs.cx/img132/9636/pic29.jpg
http://img132.exs.cx/img132/3281/pic30.jpg
http://img132.exs.cx/img132/1692/pic31.jpg





