I also ran stitch welds along the edge of the inner sill to floor and again on the outer sill to floor/inner sill... looking back at my pics I'm a bit miffed as it looks like I covered up a rotten sill on the offside which was not the case - I just missed taking pics of the old sill removed/van with no sill!
Be aware that if your going to this extent rebuild the bottom of the b-pillar jacking point properly and also as I did rebuild/repair the c-post next to the back wheels
This was the b-pillar as I found it
note how the line of the pillar disappears at the bottom of the van....
Which was hiding this....
...after the rot had been hacked off I did a transplant of a complete good inner sill and a lower inner section from another van... (this is the part I missed photographing!)
To give you an idea of what the offside sill looked like.. this is the nearside sill after it was hacked off!....
As for the C-pillar by the rear wheel I had to remove the whole bottom section:-
... and again graft in another good piece from a donor van along with a stiffening plate over the box section join
From a non technical persons perspective it's quite scary that this....
which didn't look too drastic on the surface
needed this doing to it....
once I started digging - that said being a welder/fabricator in a past life said I knew what I was going to find hence the before pics!
