In a medium bowl beat together the egg yolks and 1/3 cup of sugar. Using a wooden spoon stir in mascarpone cheese, beaten egg whites, cream and kirschwasser; stir until smooth. Set aside.
Dissolve remaining 2/3 cup sugar in coffee. Quickly, to avoid complete saturation, dip ends of ladyfingers in coffee mixture. Place ladyfingers in a single layer in a 24x34cm (9 x 13 inch) glass baking dish. Spread a layer of cheese mixture over the ladyfingers; repeat layers, ending with cheese mixture.
Cover and refrigerate for several hours. Sprinkle with cocoa just before serving.