About this detail of the Tiger
The instructions for this kit tell you to build the mufflers like so. This will build a muffler for a Late Tiger. But this is not exactly correct for the Fehrmann tanks.
The tanks were originally built with submersion capability. They had non-return valves on their mufflers. These were probably removed along with other obsolete equipment before Gruppe Fehrmann was formed, but the hinges on the mufflers would remain. Therefore, these parts should be used.