Another day, another few feet of mountains. They've now advanced their way around the outside of Horseshoe Curve and have started their way around the inside as well. My construction method was the same as previously described. The exception is the small park on the inside of the curve. I made this with a piece of two-inch foam cut to the right shape with a hot knife. I laid it atop a pair of scrap 1 x 3s. I then covered over it with plaster-soaked paper towels.