I have made one knifepleated and one boxpleated kilt following the instructions, not completely with the boxpleated one obviously!
But my machine-stitched kilts are much better, my right hand is still not up to long sewing after my accident last year. But I always keep the book nearby and refer to it regularily, especially since I do the inside construction by hand.
What I miss is a mention that you should see that the stiches on the hem should catch just one or two threads of the pleats/aprons.
The instructions for tapering are wonderful, I made my first tapered pleats now for my sons kilt - my waist and hip mearurements being the same - it all is easy to understand even for one whose native language is not english!
I am looking forward to the "boxpleat" instructions, I hope my kilts get even better then!

On the other hand I have become very critical of bought kilts! ;-)
And yes, the photos of how you sit when sewing were very helpful, include them!!