Hi Riter, the hatch inner faces are dunkelgelb yellow (Dark Yellow) the interior of the turret/inner compartments are ivory not white.
The hatches were coloured the same as the base hull colour when they were open if having a white surface then it was more of a chance of the enemy picking up on it give the Germans their due pound for pound their heavy AFV's & TD's dished out lethal punishment to enemy tankers.
Despite the amount of effort to build the Tiger family & TD's and Panthers in WWII they are my favourite WWII AFV.
Even though modeling them the roadwheel set up drives me bonkers sometimes, there are 48 road wheels on a Tiger with its cross country tracks fitted and 40 road wheels with the narrow tracks for rail transport.