wow. That's too bad. Because it looks like they used a real 1/4 to skin that car. I'd think there would be a ton of filler, because it's seemed all on the compound curves, and it's not butt welded. It's flanged. SO the metal was all distorted during the flanging There's not too much you can do for it, aside from a full real 1/4, or waiting for the repro ones to come out. And waiting...And waiting......
You could try shrinking the metal around it, but that's a lot to try and fix, and you'll still need to use filler. I usually trim the skin down so the seam is about 1/2" down from the top edge, without going around the corners. Then it's a large flat area you're dealing with..It's the least amount of filler you'll need.