Todd I think I will do the other end about the same way and I will take better pictures from the start. I laid the 4x8 foot sheet of foam out on two saw horse and cut one foot off the end using a jig saw but you can cut also using a fillet knife. Then on the 7 foot long foam left I cut two roughly 45 degree of foam off the square edges, and two 45 degree edges off the 1 foot wide cutoff slab of foam to round them up some. Then I cut gouged a little here and there to make the foam a little irregular and also stressed it some with a wire brush and glued the small slab using liquid nails to the base slab. Nothing fancy because the heat melting the foam does all the art work for you. If you don't want to buy a heat gun, a torch would probably work just as good. The rock looking foam I covered the bolt nut with looked very much like the small triangular pink piece of foam in the picture. That's what the heat gun can do to an ordinary chunk of foam to make it look like a rock. We all become Michel Angelo.