a section of the inner panel behind the seat was left off [and re-enforced differently] with the tank design change, but overall the cab inner and outer were built up a step at a time with a lot of spot welds, a "cab within a cab", the double wall design is what gives it the necessary structural stability .... if you want to cut away the section behind the seat, fly at it, if you think you'll be able to reach all the repair areas that way - have you ever tried hammering out dents from the back? mostly not simple, and if you're willing to cut away interior panels, you must have a welder to put them back? why not just use the welder and nails to pull the dents as said above? and one cheap slide hammer is useful for a variety of jobs without being a "bunch of tools"
Bill
