I just thought one thing you might wanna "add" if you weld in box to replace the rocker ...
Drill some 1" or so holes that will allow you to fish wiring through. I fished a power run on one side and a pair of subwoofer leads on the other through my stock rockers. When I replace the now bashed stock rockers with box tube, I'll be sure to have access up into the upper body holes (and a pull cord), to make the fishing easier ...
Just a suggestion of something to plan for
