Here's the direct link to that video where he reconstructs the tailgate.
www.youtube.com/watch?v=h7dMY-GobMM
He basically took it completely apart and straightened it piece by piece. He might have been better off rolling new top and bottom pieces from new metal, but that's not where he's at. He's restored many things I would have sent to the junkyard.

Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.