In medium saucepan, combine broth and cornstarch, blend well. Add milk and dill. Bring to boil, stirring constantly. Cook over medium heat one minute, or until bubbly and thickened, stirring constantly.
Spread 1/2 cup white sauce in bottom of ungreased 13x9 baking dish. Top with 3 cooked noodles. In medium bowl, combine crabmeat and 1 cup of the white sauce. Mix well. Spoon half of crabmeat mixture over noodles, spread evenly. Sprinkle with 2/3 cup of the Swiss cheese.
In another medium bowl, combine spinach, shrimp and 1 cup of the white sauce, mix well. Spoon spinach mixture over cheese; spread evenly. Top with 3 noodles. Top with remaining crabmeat mixture, 2/3 cup Swiss cheese, remaining noodles and any remaining white sauce.
Cover tightly with sprayed foil. Bake at 350 for 50-60 minutes until hot and bubbly. Remove and uncover. Sprinkle with remaining 2/3 Swiss and the parmesan cheese.