18 ga = .0478
19 ga = .0418
20 ga = .0359

Measure a piece w/o the paint on it and you'll see what you have. Various gauges were used on different parts of the cab/body. Hope this is of some value to you.

1953 Chevy 5-window 3100
In the Stovebolt Gallery
More pix on Picturetrail

Dave
Engine & Driveline Moderator

If you can't make seventy by an easy road, don't go. ~~ Mark Twain