Heat Shrinking disk, about $50 on the net. Lots of photos and "how to" video on the net.

They only bring the high spots down, not the low spots up. So you need to start on the edge first (showing as creases in your photo) and work to the inside. Hopefully you have access to the back of the panel for dolly work. They also work best on clean metal "no paint", because of friction of the stainless steel against the body panel.

I'm not a pro metal man, but even I just used this system on my son's door panel and it works!