Cozy Boat

Step 2 Set Up the Frame

Here it is with two main ribs, keel, gunwales, stems, and headboards lashed together with strips of bicycle innertube. At this point you have some control over the shape of the boat.
Fiddle around and change things now when it's easy.
The stem-headboard lashings are nylon string soaked with epoxy afterwards because I was confident those parts wouldn't need to change. It turns out this boat wants to turn around and go the other direction regardless of which direction it's going. So I'd make the next keel with less or no rocker. Water sometimes splashes over the bows, so I'd make the bows higher.
Put those two facts together and the stems will have to be taller too.