1.) For a boat that will be trailered 80% of the time versus left in the water, why not use 3/8 - 5/8 thick Douglas-Fir lumber for planking and structural components in lapstrake boats? It's supposed to be decently rot resistant and I wonder, if with generous steaming, the the green lumber can be steam-bent where the curves are not extreme. (DF is very cheap here.)
2.) How do you get 3/8, 1/2, or 5/8 in. thick Douglas-Fir for planking. No lumber yards here in the Rocky Mountains have anthing thinner than 3/4 or 1 in. thick. Planing one third of a board away seems like a big waste of material, and how can you saw a 1in. thick board into two 1/2 in. thick planks?