Be warned, the Hatteras model is somewhat speculative. There aren't any photos of her that we could find, and not much in the way of illustrations. The lines are adapted from another iron-hulled merchantman, scaled to Hatteras' dimensions. We lucked out in finding a detailed profile view of Harlan, a ship of the same class, that gave the general proportions.
But Hatteras is interesting, because she's representative of the civilian ships that were taken into the Navy to fill the gaps. Ships like Hatteras were the backbone of the blockade until at least mid-war, when large numbers of purpose-built gunboats began filling out the roster.