score:12
You are asking to prove a negative here which is not really possible. Who knows what was rattling around in Hitler's brain? Just because a bunch of clowns in the OSS found some blueprints in one of his desks doesn't prove he was plotting to take over Nebraska. Hitler was an architecture freak who spent hours going over the details of buildings with Speer, his lead architect. He had lots of blueprints. There is nothing in either of Speer's two books about Hitler plotting to move the capital of the Third Reich to Nebraska, nor is there any such thing that I know of in the Tischensprach either (although I have not read the whole Tischensprach).
The idea that Hitler, a fanatic German nationalist, would move the capital out of Germany is not logical in any way. Moreover, Hitler had plans to build a gigantic super city, called Welthauptstadt Germania (in GERMANY obviously) which featured a huge 950-foot building, called the Volkshalle, so big you could fit the great pyramid inside its dome. Doesn't sound like somebody getting ready to move to Nebraska. Welthauptstadt means "world capital".