in an armory. and there are a bunch of weapons on the walls such as bats sticks swords and balls/grenade things. then there could be moveable objects like chairs and table around to do stuff with.
I had a spar in a great mod with Subzer0z and jisse you can make your mod like this It has many weapons in it and its very fun to play in. players with an above average level of free roaming skills in toribash will have absolute fun in this :] I suggest you put the weapons mid way to the enemy.