I don't argue any of those dates... but you've got some explaining to do...
If the point of wanting the USS Midway model as a WWII carrier in Civ4... exactly how many "WWII Scenarios" take place after 10 September 1945 when the carrier actually entered operational status?
Or did you want to use a model of the carrier's keel as it was in 1943 during the war?
If you say you want it for hypothetical scenarios after the war actually ended, that's one thing, but you keep acting like it's a carrier that saw action in WWII... it wasn't, and it didn't. The Midway (in reality) is a post-war carrier... it never fired a shot or launched a plane in anger during WWII.
Likewise, as you also said, I do not dispute any of those points. The carrier never saw action because it was not needed. At the time it was put into production, however, it was done with the idea that it
would be needed, presumably being involved in an invasion of mainland Japan and whatnot.
You ask how many mods take place after 10 September 1945. WW2 1939. Hearts of Iron. Making History. Even good old WWII in the Pacific from Civilization III. All of the events, however, that occur during what was actually the post-war period are alternative histories, so I can understand your desire to keep them separate. Nonetheless, that is hard to do in Civ.
In the real world, it was a post-war carrier in terms of service. But let's not forget that it was built with the technology of WW2, because of WW2, during WW2, and ostensibly to end WW2. I think asioasioasio said it best so I won't go into a long tirade about alternative paths. However, let me ask this: Would you also characterize the
Graf Zeppelin as not being a WW2 carrier, because it was never finished? Would you say the Kikka should not be in a mod because it was only tested in August of 1945? This is one of those gray areas of history that are so often the causes of disputes such as these.

Nonetheless, I am content to hold to my postition that the
Midway was a WW2-era carrier, despite the fact that it was never used. Thank the atomic bomb for that.