This game is quite possibly the perfect framework for a great multiplayer game to play with buddies. It's already turn-based so you eliminate speed concerns, and easily wrapped into a compact network-friendly protocol, it fits the bill very well.. with a basic time limit on turn lengths, this game would be otherwise multiplayer-ready.
I don't quite understand all these antisocial folks who are so vehemently opposed to a little multiplayer. I would, as someone before me said, be VERY happy with just a basic hotseat LAN or basic IP multiplayer mode. It's really not practical to design a huge service like Blizzard's Battle.net -- 5-hour games are not condusive to that type of setup -- but between buddies with lots of free time on our hands it makes a hell of a lot of sense.