cab corners and rockers

[Huck]

On a dialy driver- if most of the metal is structurally strong, you can remove the loose crap and coat with a rust stopping paint like POR15 and you can probably use it like that for 10 years!!! If the outer rockers has holes, you may as well remove and replace it --fairly basic--just be sure to coat the inners sides real good before install.
The cab corners are a bugger to replace so I would tend to avoid that unless they are totally bad. If just bubbles and small holes, you can remove the loose stuff, coat with POR15, then glass in with no structual impact.
Floor supports should be replaced if gone but I've seen many trucks run for years with minimal supports left--not what I would do but~~. My .02--Huck