A method and apparatus for constructing a blind structure, such as a hunting blind. Two or more hub structures are formed, each with a hub and at least one and preferably four rods or support arms. The two hub structures are connected together. An expandable joint, such as an extension rod or extension arm, is positioned and connected so that each hub structure forces a hub to contact a corresponding panel. It is possible to force the panel into a concave orientation, such as in an outward direction from an interior to an outside of the blind structure.
