You will probably want to make that as 2 charts together, both using SChartBarSeries.
To get the bars touching, you will want to set the "yAxis.style.interSeriesSetPadding = @0;". You will also want to turn off one of the axis labels for one of the y-axes.
For the Y-axes, you'll want to use an SChartCategoryAxis, with categories of "0-4", "5-9", etc.
Finally, the chart on the left will need a reversed axis. You simply set this with "yAxis.axisPosition = SChartAxisPositionReverse;"
Looks like an interesting project. You'll have to keep us in the loop!