Maybe you are overthinking it. Looking at it again you are right that there is little room but I don’t ever remember having any hold ups.Interesting. So you were able to easily access the frame holes on the driver side to drill out and install rivnuts? No issues?
Yup, the plastic is all off - I'm just stumped at how you were able to fit a drill in between the frame and the quarter panel to bore the holes out for rivnut insertion - there is just so little space for working on the top two holes.