Floordford -
I did this one to match what I think is the exact center of roof camber. You can see the streamline template slightly forward of the windshield :
Then I aligned the template with the windshield, which might be the
*WRONG* thing to do :
Finally, I overlayed the slopes of the templates, bot only from the end of the roof to past the rear bumber :
From the above you can see that the slope in both cases is very close. In an ideal world you would design the kammback with the ability to slightly modify the sloping angle. In that situation you could "tune" the kammback with A-B-A testing.
CarloSW2