Preheat the oven to 350°F & then grease & parchment line 2-8" Cake pans
Sift both flours, baking soda, salt & the sugar together in a large mixing bowl.
In a medium bowl or measuring cup combine the natural cocoa powder with the hot coffee & then add the vinegar, oil & the vanilla extract whisk smooth.
Pour the wet ingredients into the sifted dry ingredients & whisk vigorously with a hand whisk until smooth (about 30 strokes)
Pour batter into greased and parchment lined 8" x 2" cake pans
Bake immediately for approximately 30 minutes or until a toothpick inserted into the center comes out with moist crumbs & the cake is springy to the touch when you gently press the center
Meanwhile prepare the ganache by heating the soy milk until it just starts to boil, pour the hot milk over the finely chopped chocolate in a large mixing bowl and whisk smooth
Let the ganache cool at room temperature to a soft spreadable consistency while the cakes cool
Build the cake as per the video tutorial