Here is some free speculation on the AF447 breakup sequence.
I've been studying the wreckage origination charts of the second interim BEA report. The large items found seem to be in close proximity to the doors. Not that I think the doors sprung open and the stuff floated out, it seems likely that the fuselage broke at or near the door openings.
See page 14 of the 2nd interim report and look at the blue and pink colored areas. These appear to be adjacent to entry doors.
Specifically, behind the cockpit, in front of the wing, behind the wing, and in front of the vertical stabilizer leading edge (4 locations).
It could be that the doors are near splice areas of the fuselage or that the door openings reduced the bending strength of the fuselage in that area.
The green marked overhead items probably all tore loose on impact throughout the aircraft except perhaps over the wing center section. Depending on the attitude of a section as it sank, pieces could be preferentially lost from one side of the aircraft.
If Bearfoil perceives overpressurization in the crew rest module, it wouldn't be surprising. Take a box that is sealed and crush it rapidly. The air trapped inside will cause any unsupported area to bulge before it blows out.
The Ethiopian 767 impact was a very different accident with significantly more horizontal velocity than this aircraft had. Only useful to show how rapidly things can turn chaotic. Didn't the wing tip hit a reef? It looked like the wing box was torn from the fuselage.