The 'second pilot's seat still folds down out of the way, and this allows normal movement of the navigator and W/Op, and the second pilot can still move about as FE. The only way into the second pilot's seat (that I can see), would be to unfold the seat at its rear-most position on the slide-tube, get on the seat, bring your legs up and then slide the seat forward. With the seat slid forward, there appears to have been enough room below and to the rear to allow the navigator and W/Op to squeeze by if they had to.
Not everything finished in the cockpit, and so don't look too closely.



