I'm exploring ideas for pouring 3 to 4' concrete capstones on my stone wall. The wall has a natural slope of almost a foot over 40 feet and I'd like to avoid spending lots of time leveling the capstones to the wall. I'm thinking about setting the capstone form onto the top of the wall and...

Just what it sounds like...Anyone ever done this before? A friend of mine has a skid of approx. 250 2"x12"x8" cap stones. Squared on all sides except the decorative side, which has a distressed / rough edge. He suggested I could take the skid and use them to build up a retaining wall for...