While I am using a piece of pine from a Big Box store as a template for the king plank, I have created a more suitable rather plank of CVG DF using board-widening technology - otherwise known as edge glued laminating. I didn't have a wide enough piece for what I needed but plenty of narrower stock.
Edge-glued lamination of three pieces of CVG DF to get the needed width:
Trimmed to width:
The plank is now ready for fitting - but I am still working on the template. Installation of the king plank also has to wait for work on the bow section to be completed: That space is tight enough for painting, to say nothing of the impossibility of installing the anchor well floor if the king plank is installed first.
So now I'm working on the bow section: sanding first, gaps between BH-1 and the first plank filled, epoxy coating, paint, installation of the anchor well floor and whatever else needs doing.