Hi AsperoO,
I can answer the questions you have about the New Generation super thin skin base. It's .03mm. The material is translucent so that the color of your skin will show through the base. It does not have stubble underneath it. You will not see the shin of glue underneath it since the translucent base blocks that. They are no colors available since translucent is the most natural looking and allows the scalp color to show. I've never experienced the unnatural sound that you describe when scratching your head---but if anyone does that's a relatively insignificant point giving the extremely realistic appearance of this unit. The hair line just disappears!
Regards,
John