Abstract: A supporting structure is comprised by a plurality of elongated base structural members each having first and second ends defining the length thereof and each base structural member being defined in part by a hollow tubular portion extending coextensively therewith. The hollow tubular portions each have a given width defined by opposed transverse sides. A plurality of bracing members are provided and each have first and second ends which define the length thereof. Attachment means are formed on the first and second ends of the bracing members for engaging with a surface on one of the plurality of elongated base structural members to effect a connection therebetween. Each of the plurality of elongated base structural members have a keyhole slot formed in the transverse sides thereof. The keyhole slots are sized and shaped to receive and hold the attachment means formed on the first and second ends of the bracing members.