Well historically speaking, it makes perfect sense, even countries today use such a CB....
I also think a "greater Countries" System should be implemented, after the first Great War or a certain tech, nation states (Not Land Based Empires) should claim their "Natural Territory" for Example: Nazi Germany, Fascist Italy or Imperial Japan. It would require the extreme parties, for example Fascist, Maybe Communist, Nationalist/Reactionary (IMO they are both the same IG), and claim a culturally similar area, for example:
France; would Claim (COnsidering they have all of TODAY's Territory) Wallonia, French Switzerland and Sardina & THe French Minority in Northern Italy (Excluding Savoie).
Germany: well, we all know that one.
Netherlands: Belgium, Picardie & the Pas de Calais, and the Bakker-Schut Plan.
UK: I have having issues with this one, if Ireland is independent, then that, however a United UK has little to claim, one could argue The Eastern Coast of the USA, although that is tenuis.
The United States of America: Basically Monroe Doctrine, with annex Canada, Although Personally I would add decision to Accept the Quebecois and the "British" Canadians.
Greece: Byzantium

Spain: And Iberian Dream would be the main aim for Fascists in Spain, although Franco didn't really do much to even attempt that goal, so it is maybe not that likely.
Russia: If the Empire has fallen, Retaking Ukraine, Belarus and the rest of the Empire is likely, and that is actually what the Soviets did.
Others would need fleshing out.
FInally, my last would be having differences in political dictatorships, Even in Nazi Germany, not everyone in the Reichstag, or Hitler's council was a full blown Fascist, some of then were Reactionaries, devoted to Germany (See General Von Stauffenberg), and in the Kremlin, we see the same dynamics, totalitarians Vs. Reformists, Having such differences in such a dictatorship, modeling this would be the issue, since the populus aren't normally voting for their representatives, it is hard to say who would be Fascist or who would be Reactionary. Also the Term Fascist doesn't Automatically imply Nazis or Mussolini's Blackshirts, I think that reactionary and revolutionary fascists should have different parties, as well different dictatorship governments, with Revolutionaries having only the "Leader" as Head of Everything, and reactionaries having a monarch, which would be an issue for a dictator, since monarchs can time-to-time disagree with the "Leader", possible leading to a revolution against your Fascist state.
Also, coups, 'nuff said.