Remove large outer leaves from the heads of lettuce. Arrange approximately 1/3 in a layer on a large serving platter. Sprinkle with 1/3 garlic powder, 1/3 crushed oregano and desired amount of Italian-style salad dressing. Layer with cooked ham and Provolone cheese.
Layer Provolone cheese with another 1/3 of the lettuce leaves, 1/3 garlic powder, 1/3 crushed oregano, desired amount of Italian-style salad dressing, Genoa salami and Capacola sausage.
Repeat layering with remaining lettuce, garlic powder, crushed oregano, Italian-style salad dressing, pepperoni sausage, prosciutto and roast beef.
Layer with mushrooms, marinated artichoke hearts, roasted red peppers, black olives, pepperoncini and pimento-stuffed green olives. Sprinkle with more Italian-style salad dressing, as desired.
Top with Gorgonzola cheese, mozzarella cheese and Parmesan cheese. Cover and chill in the refrigerator until serving.