'60 - '72 Chev 1/2 ton trailing arm geometry

Anybody happen to have dimensional data (or even better, engineering data) for the trailing arm setup used on these trucks? My Helm manuals list pretty good frame dimensions, but
I do not have data for this application. I have been seriously kicking around the idea of building a 2x3 rectube frame using this setup for use under a late 70s Chev passenger car. This will be, of course, an extended project, but I'd like to complete some decent CAD drawings prior to firing up the Sawzall.
Thanks... Mark
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