Hi all. My original track was laid on pieces of decking. While firm, it was a pain to cut on curves, and doesn't look very prototypical. For my extension, I am thinking of laying on geotextile or pond liner with proper ballast. What size ballast would I need? How deep? Can geotextile be obtained in strips, or would I need to get a roll and cut it myself? Any advice from anyone who has done it this way would be welcome.