very little if any when compared to the aluminum. If you call them talk to Bear. He can give you a definite answer.
Northstar web site states:
Trim Options
Wood:
Oiled white ash gunwales; sculpted and laminated black walnut and ash end decks; walnut and ash laminated contoured web seats hung on walnut trusses; walnut and ash laminated thwarts and yoke; stem mounted tie down loops. Laminated black walnut and ash creates a distinctive and refined canoe that is stronger and lighter.