Systems and kits for assembling and/or modifying a blanket-based structure are disclosed. An exemplary system includes an enclosure element having one or more attachment mechanisms fixedly attached to the enclosure element and configured to detachably associate with one or more environmental structures. The exemplary system additionally includes a plurality of connection features, a plurality of complementary connection, and a plurality of eyelets disposed along the perimeter of the enclosure element. The exemplary system additionally includes one or more weights selectively attachable to the enclosure element at one or more of: the attachment mechanisms, the plurality of connection features, the plurality of complementary connection features, the plurality of eyelets, or combinations thereof.