1. Currently ,you can just build one alliance tower(fort). and can't upgrade and move now ,more new features on their way so for them you have to stay tuned .
2. You need to rebuild the tower after you had clicked the "back" option.
Now advantage is, you can make your own territory, and once the tower is built, so after that time, if anyone teleports in that region or camp their troops inside then the tower will attack that castle or camped troops accordingly.
Everyone do teleport attacks and everyone make banks/farm castles for resources. And this is going on in all kingdoms, so once the tower is built, players will have to work on a new strategy as this funtion will put minimise the teleport attacks and will also increase the competition as you wont be able to put your banks/farm castles in that region if they are in other alliance. This is a war game so it will put a stop on people from playing farm ville, making resources, upgarding, making resources, upgrading. This is ehat happens and teleport attackers, rob resources, rob resources, thatd what they do. So all will have to make new stratgies and plans on this feature.