echo wren
You guys could provide the building guidelines like the proper width, length, and height. Players would then build their maps following those rules and submit them in a way you decide (like a schematic file or a world download or a world showcase using a youtube video or something).
Then, the best build could be added into the actual duels rotation, and maybe the winner gets some kind of reward, rank, or their name on the map.
I think this would be a really fun way to get the community involved and also bring the community into stray a litte more
zealous pond
plain igloo