Separate the 6 eggs. Beat the 6 egg whites until stiff & set aside. Beat the yolks until thick & lemony. Gradually add 1 cup of sugar. Add 1 cup of the rusk (or graham cracker) crumbs and 1/2 cup walnuts. Add 1 tsp. baking powder and 1 tsp. vanilla. Mix well. Fold in the beaten egg whites. Pour mixture into a greased 9 X 13 pan and bake at 350 degrees for 30 minutes. Set aside to cool.
In a heavy, non-stick sauce pan or double boiler, melt the Milk Duds with the 1/2 cup evaporated milk. Add the powdered sugar and 2 Tbsp. margarine. Cool completely.
Beat the whipping cream until very thick. Spread over the cooled cake. Then drizzle the Milk Dud (cooled) mixture over the top of the whipped cream. There will be a LOT of Milk Dud mixture, but cover the whole thing.