Honestly gster, I've read- and re-read what you've said but I don't follow. Adding dust/grime would also be another thing on my to do list. What is a sampler info node? I don't have Maya hear with me to try it out, I really need to get knee deep with shaders as this is the first time I have/will be using them and tbh I am really in the dark with them.
If you believe in telekinesis, raise my right hand.