@velkagraphics
Yeah, just checked in the '.ytd' myself & there are no bodywork textures, meaning liveries are a no go at the moment.
In the comments page for the C63, the author replies to a comment asking "Does it support liveries ?" by saying "Not at the moment" so he may have plans to add livery functionality at some point.
You can always message him & see what sort of timescale he is planning etc