How can I make life-sized Space Marine Armor?

Now we can all agree Space Marines are bad ass. My recent fascination with the Dawn of War games has pushed my desire to make a suite for myself and I was wondering, what’s the easiest way to make one? What materials could I use and what manufacturing process would be best?

I was thinking, since I’m really good with CAD modeling, is there a service I can send in my drawings/designs and they can make the parts.