I'm working on a White (16-48-920 maybe- hard to read) which was busted up bad. A guess is washed up against a tree and pressed by the force of the water until ribs on both sides cracked, so the hull was somewhat flattened. The front 10 feet was not attached to the rear 6 feet by much wood. It's going to take 11 consecutive ribs thru this area, which I have started to do one at a time, starting from the center, where the shape is still pretty good. I've got a 2x4 screwed onto the outside of the hull, trying to hold it flat and straight. But I don't know whether this canoe was flat along its entire keel-line length. Would a 16' White keel line have been flat thru the full 16', or did it originally have a little rocker? Tom McCloud