Robert, I'd like to find that file also, but since you say you would detail one yourself,
All of my GM shop manuals have very nice full page measured drawings. Dead on front, rear, sides. The best ones I've found though is in the GM Chevy Power book. Small block and large block, as well as the V6. Transmissions too.
Let me know if you want me to scan the pages for you, and then you can draw over them.
If I was really seriously looking, I would call GM, and ask for the file. Chances are good they would let you have it. Not like it's some kind of secret Windows code.
Whatever you wind up doing, I'd be interested in hearing the result.
T.M. Battersby www.battersbyornamental.com