In this tutorial we start modeling the chest of the big Prime, and we give it a couple materials, and we see the way different materials have to be given to a single mesh (object).
We assign two different materials to a single cube, that we have mirrorred using the modifier. We give it a Glossy material (for the metalic part) and also we give it a Glass material for the chest windows.
Here is the render:
Here is the video:
And if you want the .blend file, you can download it from here: