In a large bowl, combine the first 14 ingredients. Cover and refrigerate at least 8 hours.
Cut bread in half horizontally; carefully hollow out top and bottom, leaving a 1-in. shell (discard removed bread or save for another use). Spoon half of olive mixture over bottom half of bread. Layer with salami, ham, mortadella, Swiss and provolone cheeses; top with remaining olive mixture. Replace bread top. Wrap tightly. Refrigerate at least 3 hours or overnight. Cut into 8 wedges.