The Tiger's turret was attached to the hull by removable bolts. A flat ring, on the hull roof, provided a solid seat for the turret, and the bolt holes ran through it.
This detail exists on the hull roof of the "test shot". It is not visible in the assembled model, therefore it has no importance unless you want to add an interior to the hull.
But the roof of the "test shot" has a slight problem here. The distances between the bolt holes are not even. On the real tank all of these positions were 7.5 degrees apart, but in this preview model some are greater and others are less.