About this detail of the Tiger
Tigers had a large trestle attached to the inside turret wall. It was firmly fixed to the wall because it supported the gun, which was out of balance.
This is the trestle used in Mid and Late Tigers. You can see that it's bolted to the turret ring, but also there are six large bolts (indicated here) fixing it to the wall.
Rye Field provide the trestle in this model, but theirs is significantly different to the real one. They don't make it tall enough and they don't provide the wall bolts. They have a step on the level surface, but the real one had no step. They have the bolts countersunk into the surface, but as you can see in the photo, all the bolts stood proud of the surface.