Check out Jimbo's Workbench (no relation) for a great recycle of a CD spindle into an Ork Fort. One thing I always struggle with for terrain is the foundation element-- what will I use as the base piece that will provide the shape of the element. Once you get the foundation, pieces are easy to decorate.
The CD spindle is plastic and has a great shape for terrain. The scale is great and they even come in varying sizes. With four of these and two cereal boxes cut in half vertically you'll have the foundation for a fantastic and huge Ork fort.
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