Latest attempt at a new cake recipe

VegBoy wanted me to make an orange cake with Blueberry Frosting.
I adapted the frosting by using Earth Balance instead of butter and organic vegan powdered sugar instead of regular powdered sugar. 

The cake I made as follows.

Orange Cake
1 & 3/4 cups  Unbleached All Purpose Flour
1 & 1/4 cup Spelt Flour
1/2 cup Coconut Flour
2 tsp Baking Soda
1 tsp Salt
2 cup Orange Juice
2 cup Demerara Sugar
2/3 cup Canola Oil
2 tsp Apple Cider Vinegar
1 tsp Lemon Juice

Grease and flour 9x13 pan.  Preheat oven to 350 F.  Whisk together flours, baking soda, and salt.  In separate bowl stir together demerara sugar, orange juice, oil, vinegar, and lemon juice.  Add wet ingredients to dry and whisk to combine.  Pour into prepared pan and bake for 35 minutes.