Curtis mitchell of Austintown, a member of Ironworkers Local 207, signs the last steel beam that was set into place Friday at the new Ultium Cells LLC plant in Lordstown. ...Staff photo / Ron Selak Jr. LORDSTOWN — There are 14,000 beams that form the massive steel structure of Ultium Cells LLC’s 2.8 million-square-foot battery-cell manufacturing plant here. On Friday, ironworkers with Local 207 in Boardman — who’ve been erecting the skeleton for months — hoisted and set the last piece of structural steel into place in a “topping out” ceremony, marking a significant milestone in ...