Sounds cool, but there are some faults in this plan. What if one of the alliances startes off with like 20mil prest. more then the rest? It should be whoever gained the most prestige by the end of the two months wins. The winners get a package/cents in their main server.

Also, you can't have all of your cities conquered. you can only have your extra ones conquered. So you need to fix up the rules and regs. but I still think it's a pretty cool idea, even if my alliance wouldnt be in this.