What sort of POD would be required for the Holy Roman Empire to become the dominant European power and nation-state, possessing or exercising heavy influence in all or most European nations? Is this type of a wank plausible in any way, let alone possible at all? I know little to nothing about HRE internal politics, as well as its status amongst other powerful states of the Empire's time.
Assuming a proper POD can be found...
What would an HRE world power look like? What sort of governing system would run this mega-state, and how would its diverse populations behave in such a setting? I am not looking for any specific time frame for this POD to occur.