Bumpin', bangin' and grindin'..!
Today my primary tool has been an angle grinder!
With the drivers door removed, I marked out the damaged section of sill with a marker before setting to it with an angle grinder! With the damaged section of panel removed, I started to bash the crumpled sections behind the skin back into shape, including the floor area inside near the b-pillar and also the main 'beam' that runs along just behind the sill.
With things as good as they were ever going to be, I cleaned up all old spot-welds so that the 'new' panel could be refitted along standard joins. Then I had to cut the section of sill panel I had salvaged from a Lupo down to size so that it married up to the damaged area on my car. Once things were pretty close, I then had to remove all of the old spot welds and other panel joins from the new panel (where I had simply chopped everything out of the donor car).
Finally I was ready to start fitting the new, but red section to my Arosa.. the pics below show everything clamped into place, with only minimal grinding/trimming required tomorrow to complete the panel-substitution!
Tomorrow, I will pick up where I left off! ...now for a beer!