So, last Saturday, I was the lead story GM for a 36 player/6 GM Age of Rebellion game set in 3BBY about 6 different Rebel factions trying to work together to form the Alliance. It was several months in the planning and we had a team of 7 people working on characters/missions and stories, whilst also developing faction friendship rules, which included the ability to backstab other players.
If anyone is interested, I'd be happy to link the Dropbox folder where most of the work was done, though we did have a problem with one of the GMs not uploading his mission outlines at all.