You'll certainly need to download the provision profile after you modify it, but you shouldn't have to rebuild the app. When you go to share the app with someone, Xcode offers to re-sign it and lets you choose the profile you want to use.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.