When scenery made of cardboard from printable pdf becomes three-dimensional. This is the state of the art of this kind of constructions. They have got a modular construction principle, so it is all rigid and stable. Moreover you can print what you want and change the final aspect, so it is easy to built with this kit an arena more oriented on Roman architecture. I still prefer more scenery based on materials that does not undergo the humidity, but if I thought to a cardboard arena, my choice would fall on this one.

Know more on this company and their arena here.