Quick update. I filled in at the bottom with a plank on each side. I think it turned out fine. As for the rest of the planking, the front of the boat was a bit of a bear. The previous version of this kit had plywood that wrapped around to form the front of the hull. This version has fully planked side, but they are single planked. That curve is pretty challenging with 2.5mm thick planks that also have to twist down.
For my first time planking a hull (previous builds have been on my model railroad), I can live with it. Much sanding and filling and more sanding to do with it and I'm confident I can get it looking fine. At this point though, I would not suggest boarding a boat that I've planked.