It is probable that Benson will give a definitive reply,  but tentatively: white cedar ribs,  western red cedar planking, spruce inwales.  At some point OT quit making 3 grades and put mahogany outwales on everything.  Keel and stems most likely oak.  And it's your boat so put curly maple decks on it if you like.   RE: your photo - I assume you are referring to adding spruce inwale tip splices,  as doing an entire inwale adds greatly to the difficulty.    Add at least a couple temporary thwarts across the existing inwales to avoid the hull 'relaxing' while you work.   Then get the canvas off, and carefully inspect the planking & look for cracks in ribs.   Then you will know for sure what is ahead.    TM...