Begin by removing the large outer leaves from the iceberg lettuce heads. Layer approximately one-third of the lettuce on a substantial serving platter. Sprinkle with one-third of the garlic powder and dried oregano, followed by your preferred amount of Italian dressing. Top this layer with the thinly sliced ham and provolone cheese.
Proceed to add another third of the lettuce on top of the provolone. Again, season with one-third of the garlic powder, one-third of the oregano, and drizzle with dressing. Layer with Genoa salami and capacola sausage.
Continue the layering process with the remaining lettuce, incorporating the last of the garlic powder, oregano, and dressing, followed by the pepperoni, prosciutto, and roast beef.
Next, layer on the fresh mushrooms, marinated artichoke hearts, roasted red peppers, sliced black olives, pepperoncini peppers, and green olives. Drizzle additional Italian dressing over the top if desired.
Finish the platter by adding crumbled Gorgonzola, sliced mozzarella, and grated Parmesan cheese. Cover the platter and refrigerate until ready to serve.