About this detail of the Tiger
When the turret is lifted from a Tiger, it reveals a flat ring welded to the hull roof. The ring has a pattern of holes, with some variations depending on the Tiger's version.
All versions of this ring have been researched and published. This is the first version; it has 24 bolt holes plus openings for various turret mechanisms.
Rye Field's Tiger models can be built with an interior. If you lift the model's turret to see the interior, the ring on the model is revealed.
Rye Field's ring has two notches for locking the turret into place; of course there were no such notches on the real Tiger.
In their first Tiger kit, Rye Field modelled the original version of the ring. They gave it accurate bolt holes, but they omitted some of the openings. They made 4 new holes (marked here) that don't exist on real Tigers.
Rye Field copied this ring into their Mid and Late Tigers, and the transparent roof of their "Wittman" kit (shown here). But in reality, those Tigers had different versions of the ring.