Hello Mick
Just to add a rider. I have seen from your photos that most of your boats are hard chine in which case plywood is an excellent choice. Wrapping plywood around a single curve works well and it can be twisted.
I am glad you have chosen to go fore and aft with planking.
Here in Mallorca thin plywood is very hard to get and very expensive so I tend to use hard balsa which is stocked by a hardware chain, and then coat the outside with glass cloth and epoxy.
Tim Rowe