Here's what it looks like now...with only 2 screws holding it on (one per side).
6½" clearance (up position)
4" clearance (down position)
Side views...
The top lip of the edging rests on the lip of the original stock air dam. Not sure if it would hold on during driving...that's why I want to git some Coroplast behind it to provide some support and smooth out the airflow (if any) that goes behind the adjustable air dam. Right now...I'd have to manually drop the air dam and lock it in place with some tape or the pegs the edging came with. I'll see if I can find and fab up a choke/throttle cable to do it from inside the cab later on today.