Connector Clips are used to join two modules either vertically or horizontally.
When joining two modules vertically, 2 Connector Clips are used on every 2nd. timber across, so that weight down through the modules are distributed equally.
When two modules are joined horizontally 2 Connector Clips are used on the second top and bottom timber. The gap between the two modules can be used for storage too. The gap can be closed using Blind Clips, so that the two modules sights as one.