I can say there is ALOT more rust than meets the eye. Just the few pics show rust through. I would bet its far worse in the body mounts under pan, chassi. If you can not do this type of work it is going to get real expensive to fix it right. Replacing parts is cheeper in most cases, than making new panels.
So depends on where you want to take this yj. I would not put to much in it. Heck i see yjs here that are very clean, about rust free. That would cost much less than putting tons of money in a Yj restore. Body work is very expensive when it gets to making filler panels, removing rotted areas.
Its a labor of love at best.