Model wire framing issue

Hello I am trying to make an outline of this camera I modeled. I duplicated each mesh with the intentions of having an outline of the camera with out being able to see through it. So one copy of each mesh has a black material and the other copy is the wireframe. When I go to delete middle vertices and edges on each mesh(because I only want the outline) it removes the outline of the mesh. How do I delete all inner vertices and edges while keeping the outline of the mesh?
Thank you,

vx1000outline.blend (787 KB)

It sounds like you should look into Blender’s Freestyle renderer. Here’s a start:
You can find lots more info via a web search