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It looks like you have applied the template correctly - but to do it with the higher line on the window is going to be a lot harder, than keeping the existing line. Here's what I'd do: tuft test your car and see what the actual air flow on the back looks like. If you can just extend the existing surfaces (sides as well as the top) then that makes building it much easier.
You should also consider a full belly pan before moving to a boattail, as that would help make the boattail better, and you'd benefit from it whether or not you build a boattail.
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