This city was built in a holiday activity with kids age 7-12.
3 Days, a total of approx. 10 hours of building.
The base is 3m wide and 8m long. There were about 50 Kids building with 800kg of Lego.
Everything was planned by the free evangelical church in Lüdenscheid (Germany). The trailer with the base and all the lego-stuff is driving around in free evangelical churches in Germany.
Concerning the videotechnique:
Set up the camera (EOS 500D, 18-55mm Kit-Lens) with my Laptop to take a picture every 10 seconds, then cut everything together running at 20 fps so 1 second in Movie equals 200 seconds in real.