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RS,
You're correct. I've added only 30" to the existing stock length. It was an arbitrary but 'balanced' decision. Your project has it's own desired engineering criteria. Mine was based on the the boat tail extension not to exceed the car's wheelbase. Anything longer would make an uneasy visual 'weight' proportion. Creating a heavy tail-dragging appearance. By continuing the original Honda designers' solution, the material (black color) change of the lower wheel spats help lessen the visual 'weight' at the rear section of the vehicle. An intrinsic & desired Insight design characteristic. Conversely by adding (aero helpful too) large body-colored front wheel spats help bring more visual 'weight' to the front of the car & helps balance the overall proportion. As for your planned 2° - 7° 'downward' curve of the shoulder, might create unwanted lift instead of obvious 'zero' lift if it stays with the flow of originally designed flatter or nearly horizontal character line.
What is 'painting' streamlines? Sometimes creating a 'design' flourish creates more attention to it instead of diminishing it. Then again you are trying to create an aero design statement...
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