My reply would be totally but off, but regarding this
"Normals, Bump, Specular, Diffuse, and AO."
Just did a quick search and also on my personal experience, how would you go about applying AO map in a C4D Material?
Before this misleads you, this is not "official" forum challenge but rather a crowd/member sourced one. There will probably no price except bragging rights :)
The goal is of course to learn in the process a long the way.
Not yet final but this comes to mind.
(1) Two settings, day light and night time lit scene
(2) textures can be procedural or baked (image)
(3) Use Cinema4D in the process, but not strictly all C4D. (i.e. You can use Substance/Mari in texturing).
Alternatively, we can lift the rules made by the lighting challenge in the previous link I posted.
Let me know what you think.
We can do this in at least one month time. Do you think its feasible in your end? We did it before with Character Modelling.
Do you want to tag along @Cerbera?
I actually do that @3D-Pangel. Taking someone's model and texture and lighting it.
BTW, are you open to a challenge?
Would like to have a shading/lighting challenge. We can get the assets from here http://www.3drender.com/challenges/
Let me know if you are interested.
^I thought that it was under development? But it integrates in C4D much tighter that would be great. I mean non-commercial license is free.
Have you used RIS?
Sorry if this does not help at all, but I gave up with the Metaball with these kind of modelling project. For this project, I'd rather have a basic sculpt in Zbrush and texture it in Cinema4D as what I did below.