Cook noodles according to package directions until al dente; drain and lay flat on a clean towel to prevent sticking.
Preheat oven to 375°F. Mix ricotta, 2 cups mozzarella, 1 cup fontina, 1 cup Parmesan, eggs, parsley, salt, pepper, and nutmeg well in a large bowl.
Separately mix marinara, tomato sauce, and garlic.
Spread 1 cup sauce in a 9x13-inch dish's bottom; layer one-third of noodles, one-third of cheese mixture, and one-third of remaining sauce.
Repeat two more times, finishing with sauce.
Top with remaining 1 cup mozzarella, 1 cup fontina, and 1/2 cup Parmesan.
Cover with foil; bake 45 minutes. Uncover; bake another 10 minutes, until cheese is golden and bubbly.
Rest 15 minutes before slicing and serving.