I did finally get that pig finished. It was really hard to tell that it did anything positive for me, as my city crashed and burned almost immediately after completing it. I started a new city and was able to crank out a great work solo in under a day, with no other contributions to it- went with the solar farm. From what i've read, the GW Arcology is a big apartment, so eventually it sends piles of workers and students to your city. If you need workers, that's the one to roll with. Seems that with all the traffic problems, if you build solo with no other cities connected to each other... it's the only real way to prevent traffic problems. Sort of a PITA.