Heres a shot of the rear upper panel with hole cut ready to plug weld frame in place, the frame is actualy a good inner one that I have reversed and will use as an outer.
The original inner frame of the old cab panel will now become the new inner frame bolted to t'other if you get my gist
all I need to find now is the seal in which the sliding panels fit.
Heres the cab panel loosely clamped in place with frame plug welded in position.
RR.