How to animate transparent objects with solid objects

Hi, guys
I am a car design student and I am doing my final year animation in blender.
what i need help with is, how to animate a transparent effect with solid images? I need this to show particular features of my car design.
Are there any to tutorials that anyone can recommend on how to accomplish this?

The effect i am after is illustrated:

Thanks 360

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Your car is One Mesh or Many Meshes?
If one Mesh, the select desired faces in Edit Mode and assign transparent materials. If many mesh, then select the Meshes you want to keep transparent, assign them transparent material.

The car body is one mesh so id just assign transparent materials to it and then animate it as a separate layer from the original textured body so a can swap between them in the animation?

Thanks for your help