Alright, spoiler time.
No icon yet, but I will be making one.
The Panther had a project where the long 8.8 was to be mounted in the Schmalturm turret.
Here is what Tanks Encyclopedia has to say:
https://tanks-encyclopedia.com/panther-8-8cm/
In short - it would not work with the normal Schmalturm.
There was no room in the turret to reload the gun easily, and also it would have been very front heavy with the large gun mounted outside the front armor plate.
I also have a bit of a smoking gun here, that the 8,8 cm Panther would have a significant overhang of the turret rear - from the article above:
Fifteen rounds were to be stored and be accessible in the turret and fifty to fifty-four more rounds were to be stored in the hull, meaning a total of 65 to 69 rounds could be carried.
The King Tiger had room for 16 shells in the turret (rack 7 and 8), and these are big...
Thus there will be an icon of a Panther with a Schmalturm that has an extended rear overhang like the King Tiger.
Basically World of Tanks' E-50M is more historically accurate than one would ever guess - Schmalturm up front, but King Tiger bustle in the rear.
So yeah, I'll have the Panther II (not the real cancelled one, but the revisited one for 1945-46) interpreted in an odd way, but I think it will be realistic too.