There's only one flight deck and it in the right-hand fuselage. I was at a recent friends and family day at Scaled Composites and was able to see and touch this amazing plane.
Both fuselages seem to have identical windows. Is that just so they can use the same tooling for both, or is there something else in the left fuselage? Passenger/observer seating, maybe?
The fuselages are used 747s that were repurposed. They have identical windows because of the design of a typical 747, not anything purpose-specific to this mission.
It's literally just two cannibalized used 747s attached together, with a minimum number of necessary modifications made (which doesn't include changing the cockpits or forward sections of fuselage).
