The number of oxy. bottles installed is a customer option! If you opt for the total fit they certainly extend as far aft as sta. 880.
The one or two (customer option!) crew cylinders are mounted horizontally immediately aft of the fwd. cargo door about sta. 700
The bottles are either steel or carbon fibre composite.
Looking at the pictures it certainly appears to have unzipped quite nicely although it does look like there is a section of frame 'gone walkabouts'
In the lower of the pictures it looks like you can just about see part of the frame bent aft.