Wow , Thanks everyone for the amazing responses . I'm truly floored by how much everyone loves the MOC .
A few answers for people , Yes it is powered and each leg is fully independent suspension and pivotal, There is a geared technic motor inside each tread pod . When its on display the large Mining extraction claw ( in the middle of the undercarriage ) doubles as a support to the huge weight that the Lego above provides. Though by increasing the amount of rubber bands that are on the brown technic disc thingies you can increase the resistance in the travel of the suspension , enough to support the entire town, I chose that design for the legs cause I wanted Maximum travel distance so that way it could climb over large hills knowing that where WAY stronger suspension designs out there . Also I liked the way it looked too ( more important lol ) . I has manual front and rear steering as well ( that manual part is physical pivoting yourself as I couldn't build a steering thingy that could handle the stresses and still look good.
The main city Deck plate as well as the Air race platform are http://www.bricklink.com/catalogItemPic.asp?P=30489 with baseplates put on top so that way the city could be removed for transport from Vancouver to Seattle for brickcon last year. I love these plates as they give holes on the bottom to attach plate to hide it all as well and they are very strong
Up until a few days ago I had never heard of Phillip reeve or his hungry city chronicles but since Have gone to the public library and am reading the book. I think its sweet that peter jackson is making into a movie :). The design for the whole thing started with getting the castle grey wheels in a draft and I got them and then was wondering " what the heck am i going to use these for ??!! " After building a prototype tread pod I thought I was going to build a Land dreadnought or something or a aircraft carrier. Then a friend mine suggested I make it a city , and after that I had all these great Eco ideas ( solar, wind, roof top gardens. there was even a concept water wheel that I build that was going to hang underneath to gather hydro power for rivers but I decided not to ) come to me . I actually built the whole MOC and then after had to come up with the background story to justify it, something that usually happens the other way around I think.
All in all it was 80 hours build time with maybe 10 hours of prototype development. And yes I used as many colors as I could to give it that layered city look .
Anymore questions feel free to ask . Thanks so much everyone and Eurobrick admins :)
Dave DeGobbi