I finally got motivated, and had some quality cardboard to play with, so I went for it tonight. My car already has a decent undertray, so I made a grill block, and rear wheel fairings. It took about an hour. I used heavy duty cardboard (close to 1/2 inch thick), two coat hangers, packing tape, a measuring tape, box cutter, + 2 buckets of sweat. Seriously, I soaked through a shirt in the heat tonight.
