Not perfect, but I think it turned out well enough. Edges of the skirt folded over so they don't slice off fingers.
The rear of the skirt is offset from the bumper a bit (using plastic tubing as spacers) to let air out so it doesn't act as much like a parachute, and overlaps with the bumper so the airflow (hopefully) exits in a relatively smooth, backwards direction along the car's side.
Used stainless steel hardware (because I learned my lesson from last time), including nylon lock nuts. I'll now be keeping two wrenches (nuts aren't the same size as the sheet metal screws) and two screwdrivers (didn't have flathead-slotted bolts) in the car at all times in case mod removal is necessary (for towing, changing a flat, etc).
Between the hardware, brackets, aluminum bar, and sheet metal, it's turning out to be maybe $15 a skirt. Worth it for stainless steel hardware I think.
Two more pics (from different angles) in album if you're interested:
Honda Photos by IstasPuma | Photobucket