This book wasn’t too bad. It had some good information.
There are a lot of different methods to Planking and this guy used the Proportional Dividers Method.
What he has you doing is to use some Masking tape to get the outline of the Bulkhead, then to use Proportional Dividers to find the thickness of the Plank at different points along the Hull.
Quite frankly, I found this system to be a bit awkward. Mainly because the Proportional Dividers that I bought didn’t really go small enough for it to work.
I had to resort to using the Calculations Method… Which worked a lot better for me.
A good thing to purchase would be a nice set of Digital Calipers is what I would recommend. I use the heck out of mine!!!