highest rated player siege castle

I don't think a MAP siege would work out all that well. The games would cross over the month change and re-structure the entire que. Even with fast movers and a crazy timelimit, there's a good possiblity of only two or three games in a month. If you have a guy in Astralia and a guy in UK playing each other, they may never be online at the same time and the game would take all month.