the hook portion 43 includes detailing which conforms to the shape of the intersecting struts 16 so that the hook member 42 will fit over and around and ultimately rest upon the intersecting struts 16 for example the hook members are shown to be attached at the center of the suspension bar so that they will be attachable to the intersecting struts of the grouping frame as described in greater detail below the panel module 14 is installed on the grouping frame 12 by resting the hook members 42 over the struts 16 of the grouping frame 12 for ease of installation the hook portion of the hook members all face the same direction i e they each face in either the clockwise or counterclockwise direction for illustration purposes each hook portion of the hook members shown throughout the drawings face the counterclockwise direction the progressive steps of attaching the canopy modules 14 onto the grouping frame are now described in greater detail with respect to fig4 a 4 d as illustrated the canopy modules 14 are downward accessible i e the modules 14 are inserted up onto the grouping frame from a position below the grouping frame as shown in fig4 a as shown in fig4 b the module is lifted upwardly until the hook portions 43 of all the hook members 42 are positioned above the intersecting struts 16 as shown in fig4 c the module 14 is then rotated in a counterclockwise direction i e the same direction in which the hook members.