Minnesota Fats
I should probably read the Board Rules...
Well, Germany was no where near developing a working atomic bomb when the Nazi's were over run.
http://www.unmuseum.org/nbomb.htm
And though by the mid 40's they were way ahead of everyone else in rocket technology, they were not even remotely near to being able to put a nuclear warhead (which weighed at least 5 times what the warhead on the German V2 (A4) rocket weighed) on top of a missile and launch it any appreciable distance.
While it is true that WWII-era Germany was behind in developing a working atomic weapon, your stated reasons why they were behind are completely and utterly off-base. There's a LOT more to it than just rockets and payloads.
Here are a couple of links from credible sources detailing why Germany didn't possess a working atomic bomb:
PBS (NOVA) Hitler's Sunken Secret
TIME Magazine On-Line - 'The Bomb That Didn't Go Off