To hold each portion together, Martha pokes mini baseball pennants into each piece.
Put shredded lettuce in a bowl, and drizzle lightly with oil and vinegar; season with salt, pepper, and oregano.
Using a sharp, serrated knife, cut bread in half lengthwise. With your hands, pull out the soft center from the bread. Using a spatula, spread mayonnaise evenly over each bread half.
On bottom bread half, evenly layer turkey, ham, Genoa salami, soppressata, provolone, and tomatoes. Add layer of lettuce. Top with remaining bread half. Cut sandwich into triangles, and secure with mini baseball pennants or toothpicks. Serve immediately, or chill until ready to serve.