This 3D model was designed for the 3D Artist Magazine "Mech Something Awesome" contest.
The contest was to make a HAWKEN inspired Mech. HAWKEN is a free-to-play game that you can download and play (for free) online.
I did this model in about 24-26 hours using Blender 2.68a.
The completed renders are here in the "Finished Projects" forum on Blender Artists:
http://blenderartists.org/forum/showthread.php?305853-3D-Artist-Magazine-Hawken-Style-Mech&highlight=
