Nope. I didn't try anything like it. Maybe someone else has an idea.

Well, it is easily able to be done in Blender Internal—just make a new material set to "shadeless," give it the correct hex value/texture, and turn on the freestyle. Pretty simple, unfortunately manual, but rather effective, particularly with some modifications to the default Freestyle settings. If you want the two-toned look found on Wlange's renders, then perhaps using the Toon shader model could be of use.

Yes, @Qwerty7556. I've done some render with shadeless and freestyle settings in cycles. But now I want to know how the toon shader is made up..

Has anyone tried to reverse-engineered it?

@Kamteey, for the shader I've used the following node setup (using Cycles): https://imgur.com/a/ws3FN
If you have decals, feed them into the color input of the Diffuse shader.

As to decals, these are custom ones derived from the original versions I did previously for set 60134. I've simply converted them to B/W, so what you see is a mixture of freestyle edges and custom B/W decals. For colored decals you could add black outlines to achieve a comic-style look.

For the B/W renderings such as https://www.flickr.com/photos/138409334@N06/32109889844 I've used Photoshop to add a paper texture (Multiply) and put some noise on top (Overlay) to roughen the edges. You can also achieve a rough pencil effect using Blender's Freestyle settings, but that won't apply to the decals, which is why I did it in post.

Sorry for having been unresponsive, recently and thanks to Qwerty7556 for replying here.

EDIT: rendering goes lightning fast this way, which is an invitation to do animations.