I would estimate the depth of the exterior balcony with the iron railing to be 25.26" deep.
I don't know how wide it is. I don't know how tall the railing is. We do know that the balcony is 11' from the ground.
I don't know if that helps anyone figure anything out.
How do we know the balcony is 11' from the ground? Because the calculations we are provided with don't make sense in that case. Autopsy reports states the RN hanging was 9' 2" drop. That was measured from the railing to the ligature on her neck. Her height is 5'3". Her feet were estimated to be 2 feet from the ground. Adding 9'2" + 5'3" + 2'=16' 5". We can subtract the railing which is ~ 3' and the height of head and neck (not going to be more than 1'). So the balcony has to be ~12' 5" from the ground.