(Portland, OR) -- A massive moving project is underway at Portland International Airport. Huge 600-thousand-pound pieces of the new wooden roof are being moved into place. The work is done at night when flight operations have ended for the day. A remote-controlled self-propelled transporter moves the pieces across the airfield from the location where they're being built and then lifts them into place. There are 20 sections being moved. They were made using sustainable mass timber from the Northwest.