WAHOO – Omaha Steel Castings is at home on the eastern edge of Wahoo, building up capacity and know-how with its new equipment and processes on the way to full production capacity in 2015. After a year’s delay and an ownership change, the 108-year-old company has vacated its east-central Omaha foundry and moved 35 miles to the west. The land at 46th and Farnam Streets, owned separately, was sold to the…