Metcalfe #PO235 (HO/OO) Stone Platform Kit
You can make any of the following from this kit:
Straight Platforms
Curved Platforms
Island Platforms
Bay Platforms
Pre-cut components build up in a box type structure to give rigid realistic platforms.
Kit contains enough components to build up to 7ft in length (based on an average platform width of 3 inches and 30% wastage).