I have three questions-
1)The Oceanic Commonwealth is who- Austrailia? It would seem if the Nazis have all of Europe and a portion of North America then any kind of British existance would be wiped out.
2)How do you plan on explaining the massive steps in technical and fundamental scientific advances in the 30-some years that the powers went from post industrial societies to somewhat advanced spacefaring powers with FTL capabilities?
3)I'm not completely cognitive of what you mean by an alien reality in space. Can you explain that in a nutshell a little more?
I only ask the questions cuz it's an interesting premise.