XCAS is a CORE mod. It is not compatible with any other core mod, like AwesomeMod or Extended Game Core. However, there are some packages included that can be used without the core mod component.

What it does:

Core mod packages--

-- Adds many more tattoo locations
-- Teens can have tattoos
-- Optionally, you can edit the naked outfit in the dresser "Plan Outfit" game function
-- Increases the number of facial sliders the game can use from 20 to 60
-- Optionally, increases the facial slider range by 2 times or 4 times

'Extras' packages that can be used with or without the core mod--

-- Optionally, expands the skin tone picker panel
-- Optionally, increases the body slider range by 2 times. (Fat/thin, fit, and breast size)
-- A package that enables a few base game accessories for the naked outfit
-- A package that lets you tattoo naked (With the sim naked, not you. :D)

NOTE: The above description was copied from MS3B....you can download this mod or read more about it HERE