This was a fun job. The trick was to get the homeowner up to the new loft but mind the landing at the top of the existing stairs and not block hallway traffic. Her designer did a great job of directing us on the design for the rails and she found a very complimentary ladder design to match.
The problem was that the ladder in this design would be too heavy for the homeowner to lift onto a static bracket, thereby making room for traffic from the stairs or hall. The solution was mounting the ladder on a fixed track-bracket on the rails above and adding locking wheels to the foot. This allows the owner to unlock and roll out to the appropriate grade to use the ladder, and to roll up against the wall to lock back, out of the way.