One day in advance, bake and ice cakes. Use your favorite cake recipe or mix and make 14 cups of batter, then bake and cool two 6 inch and two 8 inch cake layers according to pan directions.
Level, fill, and stack two 8 inch layers for a 4 inch high cake and two 6 inch layers leveled to 2 1/2 inches each for a 5 inch high cake. Place on same size cake boards.
Using spatula, ice 6 inch cake smoothly. Ice 8 inch cake, leaving spatula marks. Place 8 inch cake on pedestal and prepare cake for stacked construction. Stack cakes.