I am baking a large 4-tier wedding cake for a friend, and she wants 2 layers vanilla, and 2 layers chocolate. I want to use chocolate mousse filling for the vanilla layers, and white chocolate mousse for the chocolate layers. I've done this before for smaller cakes, but for this one I need mousse recipes, of both kinds, that are thick and stable. I don't want any sliding mishaps!! Anyone have recipes they can share?