quarter panel help in wa

[vintagechevy76]

I got my 70 blazer home and started chipping the little bondo that I knew was in the passenger side rear quarter only to find the little bit I thought was there kept getting deeper and deeper. It wound up being about a half inch think and when I got it all off discovered that someone had drilled lots of holes for a slide hammer and messed it up even more. Dont think I can fix it. Does anyone have a good one they want to part with or know what it takes and how much material to cut off a swb bedside for a truck to make it fit? Any help is very appreciated.