Girder and Panel building sets Building Set, the only currently known software is RogCAD Virtual Girder and Panel Building Set. Here are the original Girder and Panel sets made by Kenner Toys. The parts counts were verified from Kenner Set boxes in my collection. By about 1968, the production of Girder and Panel sets had stopped and did not start up again until about 1974, when Kenner, now owned by General Mills, produced the larger 1,100-piece Sears Tower set #72001 with black girders and panels, which could make a model of the Sears Tower. These sets came with white/grey masonite baseboards. I am pretty sure
Willis Tower unfinished World Trade Center to become the world's tallest building. The height was restricted by a limit imposed by the Federal Aviation Administration (FAA) to protect air traffic. The financing of the tower was provided by the Sears company. It was topped with two antennas to permit local television and radio broadcasts. Sears and the City of Chicago approved the design, and the first steel was put in place in April 1971. The structure was completed in May 1973. The construction cost about US$150 million at the time, equivalent to $ million in 2019. By comparison, Taipei 101, built in