Remove the sausage from the casings and crumble. Combine with the ground chuck, onion, garlic, bread crumbs, parsley, eggs, tomato sauce, wine, oregano, salt and pepper in a bowl; mix well.
Spread into a 12x15-inch rectangle on a large sheet of waxed paper. Spread the spinach on the rectangle, leaving the edges uncovered. Top with the tomatoes and olives; layer 3/4 of the cheese over the filling.