Valiant Sedan Delivery

Hey Bill
I am looking at the sedan delivery roof lines VS the station wagon roof and there is a ton of difference at the top. How did they do that metal work at the top? The drip rail dips down and then comes back up on a 4 door wagon. You would think there would be all kinds of warping if they welded it there. And how did they do it at the back near the roll up rear window? Do you remember?