This is only as far as my automechanical skills go. The cake is fondant-covered; the Lightning McQueen is made of gum paste. Everything is edible, of course.
Inside are three layers of lemon cake moistened with lemon syrup, white chocolate and cream cheese filling, and Swiss lemon buttercream. The cake is 9×13-inch, over 3-inch tall; the cartoon character is about 4-inch long.