Thank you for the maps. I see that my Belgian zone in Proposal C matches their initial zone iOTL, which was later extended across southern Westphalia. The evolution of the zones is interesting. I see that it took about two years before the Norwegians and the Danes were given any occupation responsibilities, but not initially in Schleswig-Holstein. I find it curious that the Norwegians were at first positioned in Braunschweig, opposite the Soviets. I don't see any zones for the Dutch, were they not involved in the occupation or were their units just placed under British forces without any specific sector assigned? I'm a little concerned that the zone I've marked out for the Dutch might be too large for them.
I suppose iOTL that there were both administrative and logistical (and possibly political) reasons why the minor country occupation zones were subordinated to the US and British sectors rather than being independent. If that logic holds for TTL, then my original proposal (less the Polish zone) would be more accurate for the top-level delineation of the occupation zones.
As for why I didn't indicate a Hungarian zone, my reading of pdf27's timeline is that the Entente regarded them as late comers and not true members of the Entente. Neither Paris nor London would want the Hungarians to meddle with their post-war plans for Austria, so they would most likely kindly ask the Hungarians to withdraw back to the Hungary. I don't really see the Hungarians refusing such a request. The Entente might be willing to give the Hungarians a zone in Burgenland, but I don't think that they would want them anywhere near Vienna.
As for Czechoslovakia, at least initially they will have their hands full dealing with the Germans in Sudetenland and rebuilding their army. Later they might be given a sector (or subsector), perhaps in Saxony.
Yes, you got the original Belgian sector pretty much spot on!
Well yes there were administrative, logistical and political reasons why the minor Allies had their sectors subordinated to the US, British, French (and very, very briefly so as to not even have really happened) Soviet zones but that followed on from a very very different war in OTL than in TTL. This TL is a bit more akin to World War I on the Western Front except without the Trench Warfare in that the majority of the fight is done by the French, British and Belgians (with the Dutch added in this time). After World War I there were also occupation zones in Germany.
In the Rhineland. And there, the Belgians had their own zone outright.
So I would expect that here the British, Dutch, Belgians and French have their own zones. Poland is given territory as a zone/annexed land as you showed in the original proposal (probably a little bit more in Pomerania to act as a buffer to Gdansk-Danzig area) and that the Danes and Norwegians might get subordinated sectors within the British zone (though an outright Danish zone in Schleswig-Holstein also seems real possibility to me as well). Luxembourg will probably have a sector within the French zone as in OTL
Re: Czechoslovakia, I doubt they would be troubled with the Sudeten Germans that long as to be unable to participate in any occupation of Germany and/or Austria (in fact they are
already occupying parts of Austria). In OTL locally organized expulsions happened in May-August 1945 and then a large nationally organized and Allied sanctioned expulsion happened from January-October 1946. The expulsions ended in 1948 by which time pretty much all the Germans were expelled.
Overall I think something like this might be close to what could happen with a Czechoslovak zone in northern Austria along the Danube, the Hungarians withdrawing from Vienna to allow a Entente occupation of the city and the French occupying the rest.
I don't see the Hungarians refusing a request to withdraw from Vienna but they almost certainly wouldn't do so without securing something from the Entente (such as recognition of their territorial gains) first. So there might be no Hungarian zone at all in Austria, but it would likely come at a price.
Also the Saarland would almost certainly be separated from the French zone and administered differently as an outright French protectorate as in OTL.