Hi,
Thanks for the input. The feedback is really helping me refine my ideas. So I just went out to my car. Poped the trunk, and taped a 3 foot aluminum ruler to my back windshield. The ruler naturally followed the curve of the window and continued that curve down into the trunk space. I marked where the ruler intersected the back surface of my car. It turns out that I did make my drawings too aggressive. With this new data I updated my photoshoped civic
Take a look and let me know what you think
Thanks for your help