mechanical spider 3D Model

hello, this is a model for a short film. the film need a vehicle capable of carry 30 o 40 person and shoot water too high pression. I think than a model with six legs like a bug of 30 meters perform the idea. the machine is a sudamerican cop vehicle. the 3ds version is not rigged. The model is was made with six leg for the bottom, two canon in the middle and a operating room in the anterior side. the model is build in 3d max studio 6. have one piston object and two inverse kinematics in each leg. In relate to the materials have a top/bottom material in the claws to simulate dirt. And a blend material in the front side.