Replays for each of these levels are in the minimum skills thread. Here are the last four levels of Havoc:
17: 1 blocker, 4 builders, 1 basher, 1 digger
18: 1 climber, 1 blocker, 8 builders, 1 basher, 2 diggers
19: 4 builders, 3 bashers, 1 miner, 1 digger
20: 1 climber, 1 floater, 7 bombers, 2 miners.