[Trexmaster]

I don't know why this wasn't a trait that was included in the rework to begin with, but:

Synthetic Skin - Requires: Any Mechanation type : You qualify as being a race that has skin for the purposes of traits that require having skin, such as Tattoos and Lovely Face.

We have Synthetic Hair, and considering Mechanations having synthetic skin is practically cemented in the lore already, this seems like a given for a trait. It could have other effects beyond simply being a qualifier, but I believe that's the most important aspect to add so Mechs aren't outed as the most obvious race in the game because they don't immediately pop up with Tattoos on round start. More seriously, it seems like an odd restriction to place on Mechanations when they can clearly have skin.