I've never wrote a real proper gimmick match before unless you count Six-Pack Challenges which are in a way similar to something like King of the Mountain. What I found is that you can't have more than say 3 guys being fully involved at once as to really give every man in there some form of showcase and offence. Because the essence of those matches is that it is anybody's game, so everyone has to look like they have a chance of winning.
But another similar question; has anyone got any advice for writing a Hell in a Cell Match? And also a link to one in a thread somewhere would be hugely appreciated