Abstract: A panel, formed of molded plastic material in a variety of polygonal geometric configurations, for incorporation into structures built with K'NEX construction toy sets. The panels include elements, typically formed at corners thereof, corresponding in size and shape to rod elements of the construction set and adapted for lateral snap-in assembly with connector elements of the toy set. At least one pair of corner elements is aligned along a common axis and the end-to-end distance between the elements of such pair corresponds with the length of a standard rod element in the construction set so as to be capable of substitution for a rod element in a structure of K'NEX components. The panels serve both aesthetic and structural functions in the assembly.