The rocker panels on both sides are in need of replacement. The image above shows the corrosion in the cargo door rocker panel.
The passenger side inner rocker prepped and ready to go. Not sure why it’s not funky green in colour though!
The inner and outer rockers in place in the images below. Detail shots follow, showing the welding / construction with lower sections of the side reinforcement pillars replaced.
The body is braced with square section steel between the vertical pillars. The bracing fixes the position of the sides. With bracing in place the side panels and vertical reinforcement panels can be removed without losing the dimensions.
Cargo Door Rocker Before and After: