Peter Vandenbusche, of Bret Steel, welds a beam Wednesday for the new office building under construction at Commerce Drive in Augusta. “Once they get the steel up, it’s really going to take shape,” Opechee Construction Corp. project manager Jeff Daigneault said of the four-story building. The 110,000-square-foot structure will house the Maine Revenue Service and Office of Information Technology. Opechee is erecting the building, scheduled for completion by this fall, and will also manage the location.