Just a quick post on how I top cover. I use a standard 6' x 8' brown tarp from big box orange. Set it out on the driveway. There are four grommets top and bottom. I take my mapp torch and run it lengthwise top to bottom at the two middle grommets to make three sections. It melts quick, sometimes a little catches fire, but I just stomp out the little flame. No cutting with a knife needed, no fraying along the edges. The edges seal really well. One tarp makes 24' long by 24" wide. A few heavy stones or cobblestones and they don't go anywhere. They are easy to manage since they just cover the top.
fishingpol , how do you connect the 3 pieces together? Really cheap way of getting 24' of stack coverage!
Grommet set maybe? Overlap the ends and set two new grommets? Maybe even melt them together with a torch on low?