You can't get this effect using only a diffuse map. The internal parts are modeled on this one, and the outer shell used an actually translucent material so you can see the inside.
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The texture input slot in the Transparency module needs a texture to target which areas are turned off or on. You don't have a texture in there. Do you know how textures and UV's work?
Transparency usually requires a black/white image (aka greyscale image). White tells where to be transparent, and black is opaque. Or reversed dependent on the program, but if so you just invert it. If you wanted to package the transparency map with the albedo map in order to reduce the total number of image files, you…