Panzer Tracts 2-1 has PLENTY of GREAT details.
If we remain focused only on the Ausf A, B and C (book 2-1 covers the early models plus those three production models) then we learn that all of them, every A, every B and every C came from the factory with a rounded hull.
We know that "some" Ausf As had bullet splash guards bolted to the top of the superstructure.
We know that most Ausf Bs had bullet splash guards welded to the top of the superstructure.
We know that all Ausf Cs had bullet splash guards welded to the top of the superstructure.
We know that only rounded hull versions of the Pz II served in Poland and Norway. We know that "many" rounded hull models served in France 1940.
There is an entire chapter (just a few pages) dedicated to all of the official orders authorizing back-fitting of improvements.
The order that allowed upgraded armor (to the turret face, the glacis plate, and the rounded-hull front) is dated February 1940. And mention is made that this was under way during February and March of 1940. But there was specific references to certain vehicles in certain Panzer Regiments (5th and 6th of the 3rd Panzer Division), probably in anticipation of France. But not every Ausf c through Ausf C were back-fitted in this way during those two months.
There is specific mention that 4th Panser Division was in the process of getting their Pz IIs upgraded with the additional armor package, but that not all of them were completed when the invasion of France began.
In October 1940 the cupola upgrade was authorized. October 1940 is also when the blackout headlight was mandated.
So the picture as I see it is this:
Poland 1939 - only rounded hull, no additional armor. Ausf A, B and C were all there. We are talking with and without bullet splash shields, and slight differences in vision ports as the main (recognizable) differences.
Norway 1940 - only rounded hull, no additional armor.
Have not sorted out if any Pz IIs that attacked the low countries had the armor-upgrade. The only two Panzer Divisions mentioned invaded France.
France 1940 you should see both rounded-hull and up-armored versions.
After France, just about every Pz II would have the additional armor.
So my "complaint" is that since none of the hulls shown in the kit are rounded, that means that hull has the extra armor. Which means nobody should ever build this kit with the extra armor missing from the superstructure or the turret.
This means ... having kit pieces that lack the armor upgrade on the turret and superstructure are two pieces that should never be used. There should never be a Pz II A, B or C that has the angled front but is MISSING the additional armor on the turret and driver's front plate.
There is also mention that in February 1941, "Tropenfaehig" (tropical) modifications were authorized for any Ausf A thru Ausf C that were shipping to Africa to be part of Panzer Regiments 5 and 8. By 1941 all Pz IIs would have been back-fitted with the additional armor,
Since the rear hull top plate is "fixed" and there is no provision to either install the standard louvers or the tropical louvers, then the kit as shown is european duty only.
So for the purist, the advertising campaign for this kit should not state that it can build any Ausf A, B or C, early to mid war. Not true. It can only build an Ausf A, B or C for europe, starting with France 1940.
And that means they designed a kit and configured the sprues to include pieces that should not be used. Ever.
I know it is true that most won't care. And this kit will certainly see white crosses for Poland and Afrika Korps colors and palm trees. But unlike the Soviet T-26 which really can be made into one of 10 different versions of that tank, this kit is limited. And that is too bad.
If the hull were rounded, and there was a two piece plate that could be glued over it to form the angled front, this kit would open up to greater possibilities. And having the rear engine deck have a couple of different panels to show european and african louvers, this kit would be amazing in its versatility.