Rear window rust repair without welding

Welding it is.

Heck, I might even try spraying the car myself! Worst case scenario, I pay somebody to fix it.

Any thoughts on what order to do this in? The interior needs very little, just recovering the stock bench (or swapping in buckets) and a stereo system which I have a plan for. I need to do suspension work. I'm going to do a few things to the /6, just intake and exhaust and dress it up a bit. And then the body work. Do I do the body work first to avoid getting overspray on the engine and new suspension components or do the body work last to avoid scratching the paint while working on everything else?