With a ZFW of roughly 112000kg and OEW of 80000kg = 32000kg payload / 22 LD2 containers = 1.45 tonnes per container. The standard weight limit is about 1.22 t per.
It would seem to be a reasonable assumption that you could fill the lower decks of a 767-200 with LD2s without regard to the ZFW and have a few MTs left over for a few paying passengers if not too much is placed in the smallish bulk area left over down there.
Perhaps the consultants language was not perfect, but the general idea is as above ?
Nice friends by the way, SW747.
