About this detail of the Tiger
This is the newly tooled rear wall for the Rye Field "Mid" Tiger.
On the inside surface there are 6 small bumps (marked in this photo). They should not be there; they are related to the engine in another Rye Field kit, but they are not appropriate for this kit. You should cut them off.
The instructions tell you to attach an air duct here (part J104) and an air pipe (part H40). But the air pipe did not exist in these Tigers; it was part of the underwater travel gear and so it was eliminated in the middle of 1943. You should omit part H40 and blank off the hole.