Rear quarter body help needed

That sucks your body guy spleened out on you. We are a fickle bunch.
You should have just ground the heads off the lag screws and called it a day. No welding.
That being said, do not look at it as individual dents. Grind and fill the whole quarter panel with plastic filler.
It may seem absurd to you but that is how a professional would do it at this point.