Coconut Cake with 7 Minute Icing

14 1/4 ounces cake flour, plus extra for pans, approximately 3 cups
(we are subtracting 1/2 C. of the cake flour, and adding 1/2 C. coconut flour)
1 1/2 teaspoons baking powder
1 teaspoon kosher salt
1/2 cup fresh coconut milk
1/2 cup fresh coconut cream
(we are adding an extra 1/2 C. milk to compensate for coconut flour)
8 ounces unsalted butter, room temperature (2 sticks)
16 ounces sugar, approximately 2 1/4 cups
1 teaspoon coconut extract
4 egg whites
1/3 cup coconut water

Thank you Food Network
 534 calories per slice, but very low in cholesterol and sodium, and high in selenium.