Captain Nemo wrote:
Is this rectangular hole on the left of the turret, for the mounting of a future coaxial gun, like some believe, or could it be for the ejection of used shell casings?
Based on previous models and testbeds this "hole" is there for rearming the tank with new rounds.
This is what is believed to be the core turret model.
You can see the hole on the turret side.
The ejection of shell casings is believed to be this door right under the bustle.