White cedar is strong for its weight. But it's very light, and very soft. I would stay with a good hardwood for the chines and chine battens. And for the stem piece.
Long, clear spruce should still be available in Maine -- check with some of the traditional canoe builders. If you really wanted to avoid hardwood for the rails, spruce would be a better bet than the white cedar.
In traditional canoe building, white cedar is mainly used for the ribs -- it bends well. Rails may be hardwood for durability or spruce for lighter weight. Canoes are often seen with hardwood outer rails, and inner rails of spruce.
To get your questions about the right woods for your drift boat answered by an expert, contact Professor Richard Jagels at the University of Maine. He wrote (still writes?) the Wood Technology section for Wooden Boat magazine.
Richard Jagels
Professor of Forest Biology
128 Nutting Hall Orono, ME 04469-5755
(207) 581-2884
[email protected]