I'm don't have a Pig yet but am shopping for one. I looked at one today with a lot going for it BUT of course there were a few concerning rusty spots... I was hoping someone could chime in and estimate just how nasty the surgery would be to fix this. This is the worst of it, just in one corner of the roof. I guess what I need to know is can this be patched with sheet metal or do I have to pull the whole roof or ??? What do you think? I have a tig welder & loved metal shop but just how intense of a project would someone estimate I am looking at?