Preheat oven to 375. Generously butter a 13x9" glass baking dish; set aside. Bring a large pot of water to a boil; add salt and macaroni. Cook until aldente according to package directions. Drain, and return to pot. Add butter, and toss until pasta is coated and butter has melted; set aside.
In a medium bowl, whisk together evaporated milk, skim milk, and eggs. Add seasoned salt, garlic powder, 1 teaspoon salt, and 1/2 teaspoon pepper; set aside. In another medium bowl, combine cheese; set aside.
Place 1/3 macaroni in an even layer in the bottom of prepared baking dish; cover evenly with 1/3 cheese. Repeat with remaining macaroni and cheese mixture. Pour m ilk mixture evenly over contents of baking dish. Sprinkle with paprika. Bake until top layer is lightly browned, 35-45 minutes. Let stand 10 to 15 minutes before serving.