How to workout how much polystyrene you need for a hills project

  TheTerrainTutor
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Preorder my terrain book here -  ...  Just a really simple tip for working out how much polystyrene (Styrofoam) you'll need for a big build project. . Support TTT on Patreon -  ... 

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How to workout how much polystyrene you need for a hills project
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