Thanks hotdog,
I realize it's all one pressure vessel, but structurally I'm trying to describe that aft wall/curtain area that loaders sleep against in Manila when it's hot. You're right it's not a pressure bulkhead, I misspoke.
pneumatics bays are unpressurized as are the gear wells, right? So the bulkhead is further aft. So all it had to do was transverse a fire curtain.
(trying to remember from 18 yrs ago and my books are 7000 miles away.)
Good work hotdog.