could you try to do some kind of alternate history? like if Himmler wasn't born, would the Holacaust have happened the way it did. I suppose it could show just how important Himmler was to some of the policies of the 3rd Reich. Just a thought....
Something that's great for background of the Nazi party is "inside the 3rd Reich" by Albert Speer, I'm reading it for modern and it's so good