Thanks MrBounce!
I managed to complete the A-Pillar repair. It was quite a lot of work, but well worth it. Some photos of the process.
First cardboard template.
Next to fabricate the piece is metal.
Then, cut the old panel out. Lost of rust in there.
The back panel is not too bad, so I cleaned it and put some zinc primer. I also grinded down the excess of metal along the seams.
I also added a reinforcement plate behind the area to give it some more strength. The gap will be welded later on.
I added a reinforcement plate on both internal sides of the A-Pillar and spot welded to the car. All zinc primed before, of course.
All prepared with zinc primer to receive the repair piece.
Repair panel clamped in place, and ready for spot welding along the seams.
All spot welded now. Looks a bit rough, but then I fixed the gaps with some welding and grinding.
I turned the car upside down, so I can weld the repair panel to the car.
And after a bit of grinding, it looks much better.
Some primer to finish it off.
I put the car back in position and finish the other bits.
That is the A-Pillar done. It should look better with a bit of filler, but I will do that before paint.
For tomorrow I'm hoping to finish the roof patch and then that should be the end of this roof corner repair.
Victor.