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Thanks for posting the top view. How much time and money do you want to invest before the tour starts? I suspect gaining cooling air will net more than streamlining for gas mileage.
One option would be to insure that 14" vent opens to half it's width, e.g., 7" and put an 12v fan in the opening. If it's a 20" fan then you wouldn't need to shroud it and get the full opening working. Maybe a car radiator fan on an undersized motor (to keep RPMs down—up in the opening above the fan), with a hardware cloth grille since it will be right in your face in the bunk.
If you decide to open it up, go forward to the new front edge; and curb it up. Make a curved piece of Lexan (not plexiglass so it won't shatter) and put crescent shaped sides on it. Those can be opaque, 1x4" wood or whatever.
What did you think of the idea of a motorcycle fairing above the windshield? You could put driving lights in it. Having the light above you sight-line is great, off-roaders do it. And you could slide it up or down so the windscreen is the right height to be the front of you new skylight/ventilator.
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That aluminum looks to be thin enough you might consider shrinking it flat. To do that you would need an industrial heat gun (really hot hair dryer) and some dry ice. Run the heat gun over the high spots and then slap on the dry ice. Repeat as needed.
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