If there was any study-level Boeing which I’d buy, it would rather be an ‘analog’ one like the B707, 727 or 747-100/-200. I feel that we are currently over-served with digital cockpits & flight controls in the sim.
NB. I do believe that Just Flight is working on a 747 classic for MSFS - if I’m not mistaken. I do hope it will feature the flight-engineer’s station in the cockpit !