I've done these types of overlays maybe 100 times by now, just went ahead and did this one.
Some may disagree with the foil/wing option shown in pink. It's a idea which came up with an aerodynamist over coffee, but was told this cavity is best filled in to the recommended angle.
I just think it would look cool with a few diffuser/vane straighteners both vertical and horizontal. Although not the best in snow climates or on maintenance and cleaning. Might make good place for spiderwebs and bird nests too.
