W.I.T.A possibly part of the crew container exterior wall???
I am somewhat suprised by the size of some of this fuselage (or contained within) debris. It has either lost a lot of its inertia and speed at altitude (following ejection from the aircraft structure), descending individually at comparatively slow speeds; OR
Spilt out of the aircraft following a comparatively slow speed water impact and break up.
The information posted on the condition of those recovered so far would not necessarily fit with the second scenario, particularly the absence of other large bits of floating debris (non-metallic cabin bits etc).
High speed (near vertical) impact of any surface (land or water) would almost certainly destroy most parts into an amalgum of very small, highly compressed ejecta (more likely to sink).
The two fold down crew seats, any views on what cabin partition bulkhead they are from (forward or aft area of the fuse)??