This is a great idea but very ambisious. Everyone is throwing around great suggestions but we need to take one step at a time. First we need to start with the rore basics like is the game going to be 2d, 2.5d or 3d. Throw together suggestions on that and make a choice then move on to what type of engine to use. One step at a time. I completely support this idea, if we can get an end product that is open to modds and upgrades that will keep the game fresh giving anyone the option to add what they want in a format that appeals to us loyal, long time simcity gamers we can put together a game that will crush that steaming pile of crap EA is putting out.