I can see the pics.
Anyway, here's more cell phone pics, complete with bug splats at no extra charge:
View down the duct, "closed" position:
Pretty flush between lower edge of bumper and air dam:
Salvaged (found in the ditches on my walks) mudflaps reborn as brake grille blocks:
A better look at one of the black polycarb doors/duct walls:
P.S. And I went about 5 mph faster than usual besides! But a tailwind was helping out. Time will tell if the blocks are helping.