Been meaning to jump in here, but all that rabbittrailing about wings just made my eyes roll to the back of my head.
I intuitively like the idea of a splitter that becomes the front bellypan. The splitter front edge minimizes how much air is pushed downward and then becomes the flat surface that stabilizes (no, that's not the right word, but my brain isn't thinging "engineerese" tonight) the turbulent air heading "south" below the car. In fact, I'm not sure that on a car with a fairly "clean" bottom, that a splitter/front bellypan (say, back to the front control arms) and then fairing from the rear suspension back to the bumper (to get good transition to the wake) wouldn't be better than just bellypanning the whole car. When I get caught up on hunnydo's that's my plan for the Escort.
For the vertical air dam I'm planning on using 4" rubber baseboard molding, and using a piece of ABS sheet I picked up at the local aircraft mfg surplus store for the splitter/bellypan. Screws going up through the abs into the fat part of the baseboard molding, baseboard molding screwed to the lower part of the plastic bumper cover....
(yes, dear, I'll finish the cabinets first...)
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