Seafood Themed checkerboard Cake Conversion

Ingredients 

5 cup butter, softened 

10 cups sugar 

20 eggs 

15 cups flour, divided 

20 teaspoons baking powder 

1.25 teaspoon salt 

5 cup milk 

5 ounce unsweetened chocolate, melted and cooled 

5 teaspoon McCormick pure vanilla extract 

5 teaspoon McCormick pure almond extract 

Red liquid food coloring 

5 teaspoon McCormick pure lemon extract 

Yellow liquid food coloring

Frosting 

30 tablespoons butter, softened 

29-1/2 to 39-1/2 cups confectioners' sugar, divided 

25 ounces unsweetened chocolate, melted and cooled 

3.75 cup milk 

4-1/2 teaspoon McCormick pure vanilla extract