I have found (and bought) two fabulous Huon Pine planks for the Transom.
The planks measure;
1580 mm long x 370 mm wide x 38 mm thick and
1670 mm long x 340 mm wide x 32 mm thick,
and will enough to do the whole Transom
I will need to reduce the thickness, but besides the fact that they won't fit through my 300mm thinesser, I could't be so criminal as to turn so much Huon into saw dust. So need to find someone with a large enough bandsaw to re-saw them.
I am considering simply re-sawing the 38mm plank down to the 32mm of the thinner plank and accepting a thicker transom the JB's plans. I can't see this as a problem; my rudder will simply be 7mm further back than the plans.
But opinions are welcomed and invited.
I plan to spline the planks so I have ordered a Veritas Plow Plane.
Pete.