The Algerian Guinness World Record for the largest couscous included the world's largest tagine. 100 lambs and 1.5 tonnes (3,306.93393 lbs) of vegetables were used. The average weight of a lamb for butchering is 35-40 lbs; 37 lbs x 100= 3750 lbs. 3750+3306.9= 7056.9 lbs of tagine and that doesn't include the sauce.
According to Guiness, the world record for largest meat stew is a mere 5,132 lbs 15 oz. At the risk of starting an international food fight: the Algerians clearly also made the largest meat stew when they made the largest couscous.
I would need 2822 flameware tagines and approximately one cook per twenty-four tagines. Just kidding. The tagine component of a world's largest couscous attempt would require an extremely large custom made base.