A commercial hopper grain bin shell can be assembled on a concrete pad using jacks to successively support previously coupled side-wall panel rings above the concrete pad. The assembled shell can be supported above the concrete pad with the jacks while coupling a horizontal support beam around a bottom of the assembled commercial hopper grain bin shell. An uppermost ring of vertical support legs can be coupled to the horizontal support beam. An uppermost ring of hopper panels can be coupled to the horizontal support beam. The assembled shell and the vertical support legs previously coupled to the horizontal support beam can be successively supported above the concrete pad with jacks while coupling an additional ring of vertical support legs to the bottom of the previously coupled vertical support legs. An additional ring of hopper panels can be successively coupled to the bottom of the previously coupled hopper panels.