Preheat oven to 350. Lightly butter a deep 2 1/2 quart baking dish. Fill a large pot with water and bring to a rapid boil. Add macaroni and the 1 tablespoon oil. Cook for 7 minutes, or until somewhat tender. Drain well, and return to the pot. Meanwhile, in a small saucepan, melt 8 tablespoon of the butter. Stir into macaroni. In a large bowl, combine all of the shredded cheeses. To the macaroni, add 1 1/2 cups of shredded cheeses, half and half, the cubed cheese and the eggs, and the seasoned salt and pepper. Transfer to the prepared casserole dish, and top with remaining 1/2 cup shredded cheese. Dot with remaining 1 TB of the butter. Bake for 30-35 minutes or until the edges are golden brown and bubbly. Serve hot. Serves 8.