IMO this would require a German victory in the war, or at least a stalemate. If Germany is defeated, why would the Entente allow it to retain any of its conquests?
EDIT: Yes, the thread concerns a CP victory, I'm simply curious why TheInfiniteApe believes a Grossdeutschland could survive a German defeat, as he has stated several posts before.
The Entente didn't carve up Germany into its former parts after it lost IOTL and if Austria collapsed it would be more of a merger than a conquest. Only if Germany had declared war on AH would they naturally be required to give it up post-defeat.
Besides, Austrians throughout history have at various times seemed perfectly interested in being a part of Germany or even being German...
Basically you're making a larger Weimar Republic not the Utopian Grossdeutschland that was at first presented...
But Hitler being able to actively engage in Nationalism (seeing as Austria is German) and getting more popular sooner is almost as tantalizing as the added head start of re-Industrializing and re-Militarizing Germany with the help of devastated and oppressed regions of former AH.
EDIT: Zaius, did I satisfy your curiosity a bit?