I took sometime exploring basic shapes and learning different techniques for mech designs. This is alot of fun to do, finding a local base colour, painting the shapes, finding it out forms from within and some photo bashing then working in the details. The purpose of this process is to find quick pitch ideas of forms and shapes with a few photo manipulations for clarity of thought. Then after you work on exploring joints and primary objective of the mechs and expect change. But this is just a great start to get things going specially for your clients.
Check out John park's tutorials, his process and his work is amazing if you are interested.