The first part that needed to be dealt with was the bottom of the A-pillar. When I cut the old panel out, I just trimmed around the existing welds, and the plan was to die grind the material away. But after seeing what the inside of the rocker panel looked like, plus with my experience with the bottom of the passenger A-pillar, I decided to cut the bottom portion of the A-pillar out – and in hindsight, I am glad I did, it was full of crud:

Since the kick panel in front of the A-pillar also overlaps the rocker panel, it needed to be carefully spot weld drilled so I could remove the section that is sandwiched between the rocker panel backing plate and the kick panel:

With all of that removed, all the sections were wire wheeled and prepped for the new rocker panel.
The rear portion of the rocker panel is also overlapped by the quarter panel. Since I did not want to cut any more of the rocker panel out than I had to, I had to figure out a way to get access to the top portion of the rocker panel where it is welded to the backing plate. The only way to do this was to cut an access hole in the inside quarter panel backing plate:

This allowed me to get the plasma cutter in so I could cut out the remains of the original rocker panel:

Then from the bottom side, it was just a matter of using my die grinder with a carbide bit to cut out the remains:

Then from the bottom side, it was just a matter of using my die grinder with a carbide bit to cut out the remains:

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The end that is overlapped by the quarter panel was also painted with Zero Rust as I won’t be able to paint it once it is installed:

RX-7 GSL-SE Rear End
Motor Mount Jig Rental
My Classic Car