Err, just one question- how big is the poly count in the actual arena? I don't have the greatest computer in the world.... Perhaps, once you get the mod completed, you could have 2 or 3 different Arena versions- a high poly count one, with loads of effects, and clutter, and obstacles, a mid-range one, with basic stuff, and a low-end arena which would be basically a room with old building pillars in the corners, and a few obstacles like crates strewn about. And you know, make 3 copies of your Arena.esp (or whatever it's called) and edit the arena in each one accordingly. Also, how about Arena side-quests and side-bets? For side-quests, something like helping a captive combatant escape, or smuggling in a powerful weapon for somebody? And side-bets, such as, kill a combatant using only your bare fists, or kill a combatant without V.A.T.S. Or are you working on a way to disable V.A.T.S. during fights? :P