This is kinda like a map I have played before on TFC. It was called donut sumo. One person from each time had to get the sumo belt (flag), then this person had to open 1 door, waited untill it shut then another one opened, which brought them into the ring where they would battle it out against another player. The idea was to knock the other player out of the ring with rockets. If you fell out of the ring, you would die then have to wait for your turn again. The person that surived would stay in the ring and fight another person, and so on. The only problem with this was players could jump the queue by taking the flag each time.
My point is a very simlar map could be made like this for esf but a much bigger version.