Well, a palletised lower deck was always an option of the A320. I imagine that the containers used on the BaE146 would suffice, perhaps even what's used on the DC-8F's (Can't think of their designation though)...just a thought.
Airbus are saying that LD-3's will fit. I guess that's the upper deck & it'd be taking up 2 positions up there...although, I don't quite know what this pic below is showing. Perhaps one of the dedicated A320 cans???
