Good news, Mutliplayer in Aurora is possible and is_being/has_been done. Hot-seat is easiest, but at least three games (including one I'm currently in) are/were done across the internet.
You need at least three people: two or more players plus one designated SM to advance time and watch for events that might require either immediate action or an early interrupt. I'm currently acting as the SM in one game with three player factions. We're posting a rough account in a game log
here. For our game each faction has it's own password to help prevent accidental peaking, and the database is distributed through a shared dropbox folder. With .zip compression the database is 5-8 mb. Uploading a new database copy is fast (less than a minute) but doesn't allow people to simultaneously play off the same database at the same time.
Using relatively long time increments (3-12 game months) twice weekly has allowed us to play through 23 game years and counting so far.
A Co-Op game would be easier to run since you wouldn't need a designated SM, and as mentioned by jseah would allow better timing control.