Hubbly - Forgot to mention.
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On the 747-200C and 200F, there was an AFT CG limit for full upper deck occupancy.
If CG was AFT of (cannot recall the %), upper deck limited to "X" number of occupants.
Cockpit crew + additional people - based on number of escape reels.
This in case the airplane (body gear) would not extend, and fell on its tail.
Was also based on inflatable slides from upper deck + 1 or 2 upper deck doors.
These scary things they would make you jump from, and brake your neck...!
I looked in my AOM, but most of my notes for freighters have been removed.
With Cargolux, the 747-271C upper deck had some 16 F seats for passengers
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Happy contrails