Branch Crunch Cake

Name: Branch Crunch Cake
Ingredients: 3 sheets gold-strength gelatin; 1 1/3 cups dark chocolate hazelnut gianduja; 1 cup heavy cream; 3 egg yolks; Zest of 3 oranges; 1/3 cup orange juice; 2 cups hazelnut flour; 2 cups confectioners' sugar; 1/2 cup cake flour; 1/2 cup heavy cream; 1/2 cup milk; 1 1/2 cups egg whites; 1/2 teaspoon dry egg whites; 3/4 cup granulated sugar; 2/3 cup chopped dark chocolate couverture; 2 cups heavy cream; 1 1/3 cups heavy cream, plus more if needed; 1 tablespoon crushed coffee beans (crushed with a rolling pin or the bottom of a heavy pot); 2 cardamom seeds; Zest of 2 oranges; 2 teaspoons corn syrup or glucose; 1 teaspoon instant coffee; 1 cup chopped dark chocolate couverture; 1/2 cup chopped milk chocolate couverture; 2 teaspoons unsalted butter; 2 cups feuilletine flakes; Edible gold leaf, for garnish