Frankly, what you put in the Doghouse is up to you, what information do you need? It was a system used in the fast jet World and is not very relevant to light aircraft operation. I was not aware the CAA had produced any books on PPL navigation, its never been their job to do so.
Drawing great big boxes near turning points is unnecessary clutter on the chart and more likely to cover up something you might want to see than provide any useful information. Track and Time is all you really need.