I stopped by to look at a Yankee Flyer my friend has. The hull had been fiberglassed at some point. I noticed some canvas sticking out between layers of the hull. My friend was told that someone probably added a layer of cedar over the original hull in an early restoration. Another friend says these boats were double hulled, with the canvas in between. What's the real deal? Wouldn't that canvas in between hold moisture and cause rot risk? Would the outer layer be covered in canvas?