Agreed ~ When you have to double your daily rate with 2 rooms, it can hurt. We only have 4 in our family, and we still get 2 rooms. Can't imagine trying 6 in one. I think everyone would be too cramped and as said above, you need to have everyone registered to receive key for FOTL. I know it's not what you want to hear.
Good Luck with your plans, and have a great trip.