How wide is the fender to either side of the decklid? That will determine how much you can taper in plan. If you reach all the way forward to the edge of the quarter-window, it will make it easier to get a smooth transition contour and eliminate a visible seam.
With maybe a flat bar across the top of the backlight to tie the two pieces together, and a convex curve to the trailing edge.
aerohead's example may seem a long way from you car's body shape, but notice the flat underside and wheel spats. You could totally do that.
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