Terri, I zip tie 2 x 3 lumber to the vertical frame (four on each side) and then nail horizontal 2 x 3 lumber along the sides. I don't need to take the plastic all the way to the ground. When the plastic comes down the side I wrap it around lengths of 1 x 2 inch lumber and then nail it to the 2 x 3. Hope that makes sense.
I"ll try and post pics as construction takes place.
