Started on the rear wheel skirts. Passenger side first, simply because it's easier to access while the car's in the garage.
Have the support bar for the lower skirt bent into shape and attached. A three foot bar was just long enough. Using the same sheet metal screws as before to attach the ends; the bottom edge of the well on front and back is plastic so they should hold fine once the skirt is in place.
(a few more pics of details in the album:
Honda Photos by IstasPuma | Photobucket )
At no point is it closer than an inch (a little more; about 3cm) to the wheel or rim. This might be a bit more than needed, but I'd rather be safe than cut it close and I still need to attach the skirt, which will take up non-zero thickness on the tire side. Also, the tire on there is a snow tire that's slightly smaller than stock, and I plan on putting higher-profile tires on, so I want some room. (205/60R16 stock, I'm going to try 205/70R16 (which also has a 0.5" narrower tread width as a bonus))
Now to begin the Cardboard Aided Design for the skirt itself. I think two holes in the edge of the metal fender should hold well enough. I plan on using spacers for the back edge of the skirt to hold it maybe a centimeter away from the bumper, to allow air to vent out so the wheel well and skirt don't become a parachute.