Inspired by an Assetto Corsa skin , as the tag line says
Here is the original skin which this skin inspired me: http://www.racedepartment.com/downloads/mercedes-sls-team-d2.3766/
Extract the me2 folder into F1 2014/cars folder. Always backup your files.
Screenshots (please note that they are also seen in the "Ayrton Senna & Alain Prost Helmet 1989" resource)
Team D2 Mercedes 1.0
Inspired by an Assetto Corsa skin.