The three-landing dog-leg staircase will have a total of 17 steps, each 185.29mm deep. The middle flight will follow the exact line of the existing stone retaining wall seen in the picture below, which is at a slight angle to the tower and to the extension. This will look a great deal neater and made-to-measure for the site. Which it is, of course.
Above, Shane (left) and John make sense of the unusual site.
Below, John commits measurements to paper on one of the big rocks.