[Wanted] Arena Builder

Hello everyone,
I'm about to make a custom map but I'm only good at the technical stuff (Redstone, commands etc.) so I need someone who would be able to help me with a specific problem:
I need an arena.

I'm not going to tell what exactly I want, only the person who will make the arena should know it. Those of you who think that they are good at building should response to this thread if you want to help me and you will get credit when the map is done.

As I'm not going to tell you what exactly I want to have, I'm just going to tell you what I understand from the term "Arena":
Simply a building that has an area for spectators, which surrounds the area of the "game" (As example: A football stadium).

For those of you who want to know what I'm able to do, check out my profile. One of my latest creations is a custom map, and there I did NOT use an arena because the area for the spectators does not surround the football field (It is simply attached to it).

I guess that's already it, just leave a response if you want to help.

Sincerely, Plixus