Certainly possible, though it'll be tough coordinating things like mod versions and, more importantly, mission number conflicts. There is no automated way to resolve these right now, so a simple download of the mission files won't be enough to avoid getting conflicts.
I'm currently thinking about creating a Nexus Wiki to gather a lot of useful info about Nexus, its mods and to create some sorts of Nexus modder's resource. I'd need some contributors, though...