It looks like the ideal length from the top of the hatch to the tip is about the same as your wheelbase, which googles out at about 7.5 feet. Its not very practical to make one that long, that would make your total vehicle length about 20 feet long, the same length as many parking spaces.
If you look at a top view of your car, and use the same curve as the top line in your pic, how far out does that come to a point?
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