There's definitely something to be said for cooperative type shelters and theirs looks well designed. But for personal preference, I don't think I could be holed up with more than say 10 people, and they'd probably have to be people I know well. Managing 500 to a 1000 people in the most extreme of crises would be a survival situation in itself. It seems the more people you have to manage, the more rules and regulations become vitally important, and considering there's no inherent command structure like in a military setting, enforcing those rules could get complicated. Just my 2c.