Body panel assembly manual.. does it exist?

RSie said

I'm looking for a manual or drawings that show how all the body panels and parts join.. does anything like this exist? Which panels or parts go under another, etc.

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If you are looking at '67-'69, this is what you need.

1967-1969 Barracuda, Valiant and Dart Electrical and Body Assembly Manual Reprint

I just bought a copy and it shows in excruciating detail how every piece and part is assembled to construct the unibody.