Turkey Cobb Salad Sandwich

Ingredients: 3/4-1 (loose) cup watercress, roughly chopped (if needed) 1 head romaine, cut up 2 tomatoes, sliced 8 strips cooked thick cut bacon 1 lb sliced roasted turkey breast 4 hard-boiled eggs, sliced 1 avocado, sliced 2 tablespoons chopped chives (optional) 4 demi baguettes for the Cobb spread: 1 tablespoon red wine vinegar 3 tablespoons mayonnaise 1/2 teaspoon Wo