Just throw on new rocker panels... Oops, the underbody they mount to is gone too! No prob, I'll just fab some new stuff, although it is so rusted I can't even tell what shape it is suppose to be.
After finding a large enough solid area was able to use the cross-section below to get the measurements I need.
Basically everything black, below the blue line has to be replaced in order to have something solid to mount the new rocker panels(red) .
