Place the bread halves on a sheet tray. Drizzle the olive oil on each half of the bread, then spread on the marinara sauce evenly. Layer on the sopressata and hard salami by folding and overlapping the slices. Top with the Parmesan and smoked mozzarella.
Bake until the cheese is bubbling and the meat is very hot, 8 to 10 minutes. (Finish under the broiler if desired.)
Immediately distribute the olives and peppers evenly. Grate the ricotta salata over the top, then sprinkle on the Pecorino-Romano.
Sprinkle the chile flakes on top, and top with the fresh basil and a drizzle of olive oil. Cut each half into 8 slices. Serve immediately.