The average deviation is less than 1 mm, and when I get a better flat panel hammer I'll continue to remove some of the bumps. But bottom line: it's going in the right direction without a new repair piece :-)
So what is the next project area? The basic plan is to refabricate the rear-most box area, it is completely rotten and in addition, it covers the lower rear outside panel (the part with the dents). To knock the dents out, you need to cut out the box section completely. Luckily I have Mrs Erlands' restoration log, which covers the exact same procedure. The trunk:
A few repair pieces and a severely dented rear section.