For carved cakes, I like using the original White Almond Sour Cream recipe, which starts with a cake mix and can be made any flavor. It is tasty and sturdy enough for carving. This is only a guess, based upon experience, one WASC recipe would fill two 9″ × 13″ pans, so if you made two recipes it would yeld your four layers.
https://www.cakecentral.com/recipe/7445/the-original-wasc-cake-recipe
Sugar Sugar by SSmiley