Here it is. I made a skidplate for our cars to replace the flimsy OEM plate. Mine cracked in half last winter so this was a priority to get done before the snow fell again.
You'll need a 48"x48"x0.1875" piece of plastic or metal, your choice of whatever material you choose. I used UHMW Polyethylene and bought it from Midland Plastics in New Berlin, WI for $69.79 after tax. You'll also need a tape measure, a permanent marker, a 9/16" drill bit or spaded bit, and 3- M8x1.25x30mm bolts (stainless steel so they don't rust in winter).
All in all this took me 4 hours to complete, but I was messing around at the hardware store and had to do the test-fitting and such. For you guys it shouldn't take more than 1-1/2 hrs.
One more thing: if you're using plastic like I did, you may want to drill another hole toward the rear and zip-tie the plate to the control arms so it doesn't sag too much. For me, this was a temporary fix as I didn't feel like running back to the hardware store and buying some channels to stiffen the plate. I have to do an oil change in a few weeks so I'll be removing the plate then, and I will let you all know how it goes. I decided not to drill holes for the drain plug and oil filter to get the most aerodynamic benefit- I took the car out later that night and noticed that I can coast farther with this on than I could without any plate on.