use astro turf, which is available at home depot lowes etc.., then use for the artificial snow you can use snow gel, or some of my friends have even used laundry detergent. for a simple rail, i bought two pvcpipes and driled them on to a 2x4 and then used 2x4s for the base. the best thing for a box is hdpe and there are many youtube videos on how to build those. good luck