The Hachette Tiger model includes the periscope for the loader, in the right-hand turret roof. Unfortunately their kit part was modelled on the periscope from a King Tiger tank, and it is not correct for a Tiger.
The lower part of Hachette's periscope assembly is surrounded by a rectangular frame (it was a quick-release mechanism, used in the King Tiger tank).
In Late Tigers, such as the Hachette kit represents, there was no frame. This is a museum example (the green paint is not original). The periscope itself is removed, revealing the slot that holds it. There are wingnuts and clamps on each side to hold it up. At the top of the photo you can see a soft headpad, also missing from Hachette's kit.
You can improve the accuracy of your Hachette Tiger Tank by cutting the frame off the periscope.