[opinion]
There is one huge fundemental flaw in this contest, which is that competitive ctf, just isn't fun to play. Now you could argue that the whole point of the contest is to make it fun to play, but ultimately, the game will still consist of half an hour, on the same map, with no changing battleground, and probably with one player on the team forced to do the deathly dull job of engineering to stop backcaps.
That's my experience with competitive ctf - saying that, I've only played turbine competitively, and the setup seen in Atrophy may work. In the end though, it's just not as exciting as 5 CP. Turbine, I may point out, is utterly dull and unexciting
I'll be entering the contest, sure, but I don't give much of a chance to any of the maps being played with the same frequency as granlands. Why? Because CTF isn't very fun to play in 6v6.
[/opinion]
And to clarify, as I've played it, the timer is set to 30 minutes, with unlimited captures of the flag in that time. Whoever gets the most wins, if they get the same, it's a draw.