So today has... progressed. I finally got the trailing arm off, I had to use a hacksaw blade as my cutting discs just weren’t big enough for the last mount furthest inboard. Not in too bad nick just the predictable buggered spring seat.

The bodge revealed a poorly welded inner skin, which revealed what was left of the inner skin and inner sill
This is way worse than the other side was, basically the only strength left was in the sliding door roller guide.
Because I’m removing so much from this side and need to take the c pillar out to above the door channel I’ve decided to brace the c pillar to prevent spreading that others have mentioned.

When looking from underneath the floor is missing around 2.5-3cm which will be much easier to repair once the sliding channel is out which has a repair panel ready and some work is needed on the cover plate too

The plan is to repair the inner skin on the c pillar then the c pillar to keep a reference point. I will the patch he rear chassis rail ready for the inner sill. I will also have to make the filler plate between the floor and c pillar that closes the top of the inner sill as it is terminals rusty even if it’s still strong.
Once the roller channel is out this will give me access to the b pillar to renew the bottom 10cm or so. I made a b pillar for the other side and it was a PITA and took me days, so I bought the whole pillar. To me it was worth the money for my time.
Spot welds out and front seams welds cut through in the cover plate. I reckon this will be much to repair on a jig on the bench rather than upside down under the bus.

I have the inner sill from schofields which just needs the drain holes cutting out and plug holes so I can waxoyl, inspect later. I have a genuine c pillar inner panel. I need to male the c pillar but this is a straightforward shape. I have the outer skin for the c pillar now too. I need to patch the rear chassis rail.
The spring seat is on order from BW.
I have the door roller channel repair panel, I have steel to patch the top plate and steel to patch the floor.
I have the full b pillar inner and the repair skin outer, but I again have to patch the front chassis rail.
While I’m at it all my paint products are ready:
Etch rattle can primer
Glasurit CV Epoxy primer
Glasurit CV colour coat
Kent chip guard (this stuff is amazing, the gun gives a reall factory look and it’s overpaintable really quickly)
3M Unterbodenschutz for last.
And as Norm Abraham says safety first, I can’t talk highly enough about the 3M versaflo range, at 180 it wasn’t cheap but a full face mask with airline fed air system with ear protection it’s already saved my face and eyes way better than just glasses, it’s comfortable enough to wear all day. I’ll get a pic tomorrow.