I think he's referring to the slide out type that were used up through 1950. I paged thru my Jim Carter catalog and saw the drawing he was referring to, and it was the earlier style.

But the later type like in your picture would be much easier to fabricate.

Mine (late style) isn't installed yet and I'd be happy to send pics and dimensions.

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.