Preheat oven to 350 degrees F. Use tomatoes held at room temperature until fully ripe. Core and cut tomatoes into 1/4 inch thick slices; set aside. Cook macaroni in unsalted water according to package directions (makes about 5 cups); drain well. Lightly spray a 12-inch pizza pan with nonstick cooking spray. In a large bowl combine macaroni with 4 tablespoons of the ketchup, the eggs and 8 slices of the cheese torn into small pieces. Spoon macaroni mixture onto prepared pizza pan, pressing down lightly to even out. Around outside edge, arrange overlapping tomato slices; brush remaining 2 tablespoons ketchup over tomatoes. Cut 4 remaining cheese slices diagonally in halves; place partially over tomatoes. Arrange hot dog slices in center. Bake until mixture is hot, about 20 minutes. Cool for 5 minutes before serving.