Do it on the frame. To be honest, it would have been easier to do a floor with rockers as opposed to doing it separate. Make sure the A pillar braces and front cowl shoulders are good. If not, replace those as well.
I dontsee how i could do onthe frame with everything i have seen and researched? I have not seen a floor pan with outer rockers already attached? The pillar braces and front cowl shoulders are good. I will do more reasearch.