CmdrKiley is correct as there is no specific reference in the rules, but it can serve nicely as a bunker, ammo dump, or small fortification. The rules do have sufficient guidance however to be able to assign values to structures that you might want to use, such as your cardstock terrain. The Tehnolog kits such as the Hexagon and Platformer boxes are very useful for SST, as you might have noticed on the forums.