Destruction mode went up to 11 last night when I cut the bulk of the LH rocker out. I have been a little concerned about such an invasive procedure but so far it has all been a piece of cake. I bought a plasma cutter last year when I was heavily into Ronni's VW and it has certainly made short work of this job, It had all been cut out within an hour, a whole bunch easier than the myriad of grinders, cutting wheels, and grazed knuckles that I had when I was doing the Mustang, I would wholeheartedly recommend one to anyone contemplating this kind of work.
I took measurements of the door aperture before I started, and I also braced the seat crossmember so that stayed where it was. I kept checking my measurements as I went along and nothing seems to have moved, I think maybe the top part of the rocker that is still in the car has bowed out slightly but only by a gnats knacker and I think will straighten out once I pull it in against the new panel, assuming that fits OK, but there doesn't seem to have been any movement at all.
The first picture shows a piece that I cut out and illustrates the full extent of the rust that was inside the rocker, I could have gotten away with just the repair section although there still would have been some pitting and corrosion in there that would have needed cleaning/treating, I would have also had to have made local repairs to the jacking points so this is definitely the nicer repair I think, and of course it keeps it all genuine Mercedes - which is nice.
Once the rest of it is cut out which I will do today I'll clean the remaining metal and then prime and topcoat it all inside with the mushroom colour I had mixed, same with the inside of the new rocker channels. I also got some weld thru primer which I am planning to spray on the inside of the joints before I weld but I'll try a test piece first to make sure it doesn't interfere with the weld.
Am hoping to have the rocker clamped in place by the end of the day so I can weld it in Monday......