Shelter structure and material kit Build any of 3 designs or create your own. Use our enclosure material to finish the outside of your structure. Have fun and remember to use strengthening methods such as triangulation, folding or piping to strengthen weak points. This school project kit has many developing aspects. Work with different kinds of material and evaluate your steps. Shelter structure (frame) and Enclosure material for shelter structure can be purchased separately. Currently there is no video for the enclosure of the structure, but you can view the frame structure video on our site