Try to stick to an engine with limitations similar to what they have in their games. Using Marmoset with HDR cube maps for lighting doesn't make sense if their titles are using much simpler tech.
It's a 3D game character model with texture/spec/normal. But they are asking the Shader setup needs to be done in Maya with Maya stock shaders or mental ray. And for the turn in, they are saying renderer and lighting of my choice. By renderer by my choice are they saying default/mental ray or are they saying I can use…