74 and the length of the tapered sides 83 correspond to the biased distance between tapered ends 65 of panel ribs 64 the upward slant of tapered sides 84 are formed in opposing orientation to and in mating alignment with the downward slant of tapered ends 65 of panel ribs 64 and the length of the tapered sides 84 correspond to the biased distance between tapered ends 75 of truss ribs 74 in lieu of tapered sides 83 and 84 center core bell can be formed with extended flanges comprising tapered sides formed in opposing orientation to and in mating alignment with the slants and locations of tapered ends 65 and 75 with thicker mass trending upward or mold assembly can be fashioned having spines that are attached to the top plate 54 and comprise tapered surfaces that are formed in opposing orientation to and in mating alignment with the locations and slants of the tapered ends 65 and 75 with thicker mass trending upward as seen in fig9 the truss module 60 is placed on and rest upon pallet 50 prior to the pallet 50 being delivered beneath mold assembly 80 or the truss module 60 can be placed on the pallet 50 when the.