Check out the live construction cam set up at Providence Park. Shots are uploaded every 15 minutes, and there’s a time lapse available. You can also click through previous photos, but so far I haven’t gotten the date picking functionality to work.
Update: Added some more stills of precast sections and crane at work.
In this picture you can see that the seating rows are made from precast concrete lowered into place on the hangers by crane.
UPDATE: Added some more details of the precast parts.