actually using the Standard poser units ... never changed the settings ..." it should be Feet " in the interface Units. I think most users just leave it as it is , personally never had the need to change this interface setting :)

Anyway, it is up to any individual how he wants to achieve these Veins effects or even scales on a skin, this method is simple, does the trick very well for many effects without having to mess around with loads of nodes in cycles or whatsoever being frustrated not getting good results. Guess people are happy if getting a good 2d render result is a simple way, same thing for skinning a model :)

I also think it would be more convenient for forum members getting Mt5 setups instead of complex screenshots of setups that they almost cant figure out  how they got built, ending up to give up, for the one who is giving a solution it is also the better choice to drop a Mt5 sample rather then making screens and trying to explain the cause, for most it just needs to work in a simple way.  

Vascularity.Mt5 Download

Info: Adding this setup to Displacement on head and neck could cause a inverted effect on the right side of the figure so better use Bump in these two regions for superfly