Regarding the plastic going to the ground, I have a wainscoting of old boards about a foot high going around the outside. It provides substantial protection from animals, lawnmowers, weed wackers, etc. I attached it to the metal frame. In hindsight, I am wondering if I should have driven in wooden stakes and attached the boards to those. This would have made it easier to tuck the plastic all the way to the ground behind the boards.