YWIW
Re. cargo doors, that was another of the Bev's peculiarities. For air freight drops the normal cargo doors were removed and 'elephant's ears' attached. These weren't necessary for the freight drop but WERE necessary if you were dropping troops from the boom as well. This was discovered on the initial trials when the trial dummies were dropped through the boom hatch and DISAPPEARED!!
Following the direction of the static lines showed that the dummies were now resident in the freight bay! This was considered to be 'not a good thing', so the 'elephant's ears' were designed to (successfully) change the aerodynamics.