I guess it all comes down to relative sizes………i.e. what size will the ‘wings’ be on this design? A330 ish? As you know Vega, the fuel in a wing is a very effective damper, and can prove quite useful in keeping loading under control, so I personally cant see them making empty wings, especially with all that volume going to waste……….you could put a cavity between the ‘wings’ and the ‘fuselage’ to create a safety barrier should there be a tank rupture in that area.