(sorry for my english, i'm not an native speaker)
Excellent scenario with a unique "behind closed doors" atmosphere that really fits with an horrific game.
One point : I will probably make a few (minor) changes in the scenario because I am not sure my players will always follow the linear frame (I will not spoil but there is a secne I am quite sure they will not respect what is written in the pitch).
One recommendation : I would propose to add the "Cutaway Views Of Hindenburg Passenger Area" we can find on the Hindenburg Internet website because in the scenario, I had some difficulties to understand the link between the two decks (the scale does not really correspond : try to overlap the two levels with the stairs and the lift, it does not match).
But, this is only a detail.
Congrats for this outstanding scenario !