Wireframe with hidden internals

[mertmg]

this is great. i

[bdesign]

Thanks! 

[DriesV]

Wow, this is ingenious!

A quicktip:
You can make this even simpler, by attaching a Color Invert node to the Surface Backside Mask Node. The backside lines will then always be invisible though.
You can use the Outline Width Multiplier in the Toon material to create thicker outlines. This will help the parts stand out more.
See attached Wireframe.png for the Material Graph setup.

Conversely, if you really want to go crazy...
You can connect the previous material chain to another Toon material (also with transparency = 1) and put a Color Composite node between the Color Invert and the Opacity of the base Toon material. By tweaking both Toon materials you can alter e.g. the colors of the front and back lines. By adjusting the Source Alpha in the Color Composite node you can tweak the transparency of the back lines.
See attached Wireframe-crazy.png for the Material Graph setup. A ksp is attached as well.

Have fun!

Dries

[bdesign]

Thank you Dries! It is a great compliment coming from a KeyShot master such as yourself! Apparently quite a few people are finding this useful judging by the cloud downloads Your additional suggestions are very cool! Thanks again...

Eric