I set up the arms and the body shaders to demonstrate what you need connect....

The shaders are already in the .obj as Nano2:Arm, Nano2:Body, etc.

For the arm and the body there is .dif (diffuse color), and .spec (specular reflection) and .ddn (bump: tangent normal space).

For some of the others there is also .alpha which plugs into transparency.

NOTE1: I have grabbed a screen shot of the arm and body shader setup. Note I deleted all the 2d place nodes as they are not needed.

NOTE2: Also when you apply the dif color it will also apply transparency (because the file is png). Simply break the transparency connection after assigning the color file.

NOTE3: Remember to soften all the normals as the model is imported with all the normals hardened by default. I do this for each part as I go so I have a visual clue what parts still need to be worked on.

Here are some screen grabs to help you see how I assigned the shaders...