Preheat the oven to 400 degrees F. Hollow out the center of the ciabatta loaf to form a rectangular "bowl"; set aside. Cut the removed bread into 1-inch cubes; spread 2 cups of the bread on a rimmed baking sheet (reserve the rest for another use). Bake the bread cubes until lightly toasted, 5 to 6 minutes. Let cool.
Combine the lettuce, tomatoes, cucumber, roasted red peppers, salami, prosciutto, soppressata, cheese and toasted bread cubes in a large bowl. Whisk the olive oil, vinegar, 2 tablespoons water, the oregano, 1/2 teaspoon salt and a few grinds of pepper in a small bowl. Drizzle the dressing over the salad and