Parts 16-17-18-19-20

Part 16 (The pieces of #part 16 are in the pack 3.)

Part 17 (The pieces of #part 17 are in the pack 4.)

Part 18 (The pieces of #part 18 are in the pack 4.)

Part 19 (The pieces of #part 19 are in the pack 4.)

Part 20 (The pieces of #part 20 are in the pack 4.)