That's an ambitious goal.
It needs to be aerodynamically perfect. The killer is the top down driving enjoyment. Maybe chop the windshield and add a metal tonneau cover and headrest fairing?
That said, your list doesn't include a rear diverter.
For the rear wheel fairings, I like what I call the Bonnevette:
Starting just inside the tire they flair out to flush with the outer tire face at the back. Wheelwell turbulence is separated from the underbody flow and thrown outward into the ambient airstream. They would also form the outer fences of a diverter bell with a 4° angle roof.