Been there done that. I read an article recommending to lead the seam to fill those pinholes. I know I don't have to ask for your opinions to get one here ... but what's the general opinion on that idea? Same article gives some ideas on how to do fit-up (working on a muscle car so I don't want to link it) using clecos to hold the parts in alignment, then cutting through both panels with a thin blade between each pair of clecos and welding between to hold the alignment. That way the gap is consistent even if you can't cut a straight line. Seems like a plan to me, I just haven't practiced enough to do it on my car yet. Since this repair would show I'd rather find someone who knows what they're doing, but those guys are few and far between here judging from the ones I've talked to.