Biggest Loser style challenge

I'm the kind of person who loves a challenge. The feeling of being the best beats out most other feelings. I think that I'd lose weight better if I'm competing with other people. I'm thinking about starting a "Biggest Loser" type challenge. I'm flying by the seat of my pants here so bare with me. Here's what I'm thinking;

Limit the competition to about 12 or 14 people. Split evenly male/female. I'm thinking of having men vs men and women vs women. We have a mutual weigh in day every week. Weights are posted on the group page (not sure if that's possible on MFP or if it'd be easier to do on Facebook). I'll convert the weight loss to percentage loss and each week the male and female with the lowest percentage will be out. The last two of men and last two women will have the winner of each group determined by total percentage lost for the whole competition.

Another option is make two teams, men vs women. Calculate it all as a team. Lowest team loses their lowest percentage member for that week. Then the final 4 will be individuals.

Anyone interested? Lemme know what you think or any suggestions. If I can get at least 6 men and 6 women I will set it up. If There aren't enough of one or the other we will do it as individuals with a minimum of 10 people.

Thanks,
Tom