Alright, the tutorial will be out tomorrow! The plan was to finish it tonight, but I found a few areas where the system needed a little more attention.
For now, here is a small example of the versatility of the shader. With a little experimentation using instances, it is possible to simulate most types of car paint surfaces.
link is to a small gallery of the shader in use on a motorcycle asset, with more advanced lighting.
http://imgur.com/a/f8tnM
