I overall like your thoughts about the robbing part. This way robbing a bank will feel much more intense and you will actually NEED to cooperate with each other, use certain tactics and all of that stuff. Most important for me will be this: Where will the world bank be located, because since we live in a state which contains three main cities, there has to be a reason for the bank to be located in one of these three cities. I think it has to be located in the city, which has the strongest police units.