I'd say that's going to require quite a bit more work than just a slide hammer and filler. In fact with the damage on part of the panel which has a lot of strength to it (on a shaped piece and also on a corner) it is going to take all the skill of one of those talented old school panel beaters to work their magic. I would probably even go so far as to say that if the existing panel is repaired rather than a new section welded in then it would probably need to be cut from the car so it can be properly beaten and shaped from all sides on a bench. And it's that sort of manually intensive labour that's drives the cost up.
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