I'm thinking the template should be aligned like this.
Aerodynamics Photos by kach22i | Photobucket
I could not detect an arc to your cabin roof, the "0" point should be on that high point if there is one.
The newer trucks have one, the older ones don't.
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George
Architect, Artist and Designer of Objects
2012 Infiniti G37X Coupe
1977 Porsche 911s Targa
1998 Chevy S-10 Pick-Up truck
1989 Scat II HP Hovercraft
You cannot sell aerodynamics in a can............
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