I don't really know if someone has had this idea before and I don't even know if this is the correct place to share my idea with you but whatever.
Well, the idea is based in inserting a sumo zone in the middle of a fort map (I don't know if it is possible but you guys will tell me).
So the map would be like this:

I think this type of map would be pretty funny but I don't think a server with this settings would have people normally since it may need a minimum of players to be played properly. That last reason is why I say it would be an idea for a tourney.
Its just a prototype so if you guys have any idea to improve what I say, tell it. I have thought it like this:
The normal fort zones would give the same points 4, and sumo zone would give 6 points (so it's important to fight for it and even to die for this)
The round ends when both zones of any team are conquered.
The limit score should be more than 100 (like 140)
Each team should be based on 6, like normal fort and the system of the tourney would be the same as ladle.
I have no way to try that settings on a server or even to configure a server with that settings (since I'm a noob on it).
So if you like that idea and people is interested in try it out we could have a nice tourney in my opinion.
Thanks for reading and sorry if this is not the correct place.
<3