http://www.3dtotal.com/index_tutorial_detailed.php?id=1670&catDisplay=1&roPos=1&page=1#.UXjbRrUqySo

I love designing machines and my task for this tutorial was to design an amphibious vehicle. When I was in the designing phase and was thinking about my amphibious armored protected car I decided that I would call it AMP (as it is short for amphibious). This tutorial will not be about modelling, but will be about design and post-production in Photoshop.