I have a 16 ft canoe. It is similar to Peterborough, narrow ribs. If the picture will show it, the ribs are narrow but laminate of three pieces. The outer piece is tapered at the end. Thus it is three laminates around the hull but when it reaches the gunnel the taper is down to two thicknesses. As you see, it is not a wide board even while it is wide board construction. Got it from a member who felt it worthy of fiberglass removal. Obviously, it was canvas originally. Closed gunnel so must be early 20th century. Might add, this canoe must have been built on a Canadian form. It oddly enough had a very wide, 1 1/2 to 2 inch keel and two bilge keels as well.