Ah, brilliant thanks
On the flat sheet side I think it might have been welded (or was going to be - there's a bad repair to the lower panel that needs chopping out and replacing with the right metalwork), and the guy doing the welding said the floor needed to be welded to the rear panel, from above and below. But then he also said the cab needed to be welded to the chassis and took a fair bit of persuading otherwise...
So the rear of the cab is floors welded to inner sills and trans tunnel, bolted to rear panel, which is welded at each end to the B posts then? Or something like that? With seam sealer (is that avoidable, as I find over time it seems to shrink, and let moisture get trapped behind it causing slow rot) along the join.
What do I need in terms of rubberwork? The pick up side of things is going to be non-original, but I take it there's a seal between the back panel and posts/ roof. Is there one for the floor as well, or any other bits I might not know about? Maybe something between the floor and chassis? I can't for the life of me see how the chassis and cab are bolted together past the area round the bulkhead, other than the little brass screws around the gearbox cover and the 2 bolts for the handbrake

And I don't like the way the floors seem to sit pretty much on the chassis with no insulation or fixings...
Where the floors and rear panel bolt together, is it just nut and bolt to hold them, or do the bolts hold anything else on/ go through something else?
Sorry for so many questions, I sometimes feel this is a bit of a mammoth task considering the first time I saw a pickup in the metal was when it was boxes of bits and a chassis tied to the wall
