Have been thinking about the rock walls. Though I plan to continue with the
rock I have been using. Went to a Home and landscape show yesterday. Saw
this guy who sprays insulation foam for houses. If one was to get a guy to
spray a wall with a ft thick of this stuff, then cut it the way they want
and cover with a thin slab of concrete. They could have a rock wall in a few
days. Would be something to see how well it works?