Never flew the Argosy but as a young soldier in Aden I do remember one day coming from Little Aden across the causeway to Aden proper and seeing an Argosy sitting in the water looking at us like a bloody big croc!
Regarding the Capt. locking himself in a car, did happen to a Singapore Airlines skipper on a B747 freighter carrying, I think, a 'special' Mercedes with non standard security.
Heard that flying the Beverly was like flying a council house from the upstairs bathroom window!