The pick-up method for single bottom interface

One can see that, if the cabin is on an A carrier, the B attachment can approach either from the side or from underneath. The actual transfer starts with B a small distance below A (about 20cm). B then rises relative to A and during this motion they are engaged to each other and the cabin. When B about 20cm above A the cabin is linked to  B and A is disengaged and can be withdrawn sideways or downwards. During the transition the cabin alignment will move from that of A to B, allowing a few centimeters of misalignment to be accommodated.