Got the driver side cab corner done. Didn't end up doing any slice and dice. Decided to work it from the backside of the cab, then massage it around the corner a weld at a time with some tapping to bring it around. Ok, some of the tapping was more like banging, and I missed the gap on a weld or two
It's going to need a bit of filler, but I think I can make this look ok. I'm feeling pretty pleased with myself on this patch.