Yes - I'm familiar - Francois Verlinden made this popular as a base in his Diorama publications. It is a much finer grain of styrofoam (not "peppbles of plastic) that has a stiff and fine "honeycomb" texture. It cuts easily and can be sanded smooth. To use it as a base, you will need to first shape it, then coat with a thin layer of plaster of paris to seal it and smooth the surface. Wait until it firmly hardens and you are ready to use it as your base. Thinner sheets can also be used for building walls. Your best variety will be found at Pool Supply Stores, Boat shops, or on occasion at Home Depot or Lowe's. It is not too expensive and is quite light.