In the Appendix of Stories In Sand, I include highlights from my design sketches. Pictured here is the sand palace on the left and the overall layout on the right. I think this drawing was version seventy. The palace was a full walk-over, and the walk-under sculpture. We used shipping containers for the tunnel. It did collapse in a little as the sand was filled in around it Paving stones were placed throughout the park which really polished things off nicely.