This is a long thread, so for those who haven't seen what I was just talking about, here are the diagrams...
Early secondary hull partitioning...
And some of the graphics used in TOS (including the hull pressure compartments and turbo lift diagrams)...
And a better version of the turbo lift diagram can be found here
... That's embarrassing
Don't worry about it... you'd be surprised at how often I mix up some of these numbers (and waste a ton of effort before noticing).