WST1484 River Pass HO Layout KitRiver Pass Layout Kit includes the materials needed to build a lightweight HO scale 4' x 8' SubTerrain layout base. Risers and Inclines Declines create hills, mountains and low lying areas. Foam Sheets make flat, elevated areas for towns and buildings while Profile Boards form perimeters. Build up the terrain with newspaper wads and Plaster Cloth to make mountains, plains and other hard shell terrain features. The sturdy, completed layout needs no