There is a cool video on TFormers.com that shows the Bumblebee robot from Transformers being assembled (12:54 running time).
Per the video, it is 20′ tall, 15′ wide, 8,000 pounds, takes 4 men 1 day to assemble with a crane, forklift, and other special equipment. It was flown by plane to Seoul from L.A. It was used in particular scenes in film and was built by 20 propmakers over the course of two weeks.
Jason De Bord