I made a rudder, tiller, and dagger out of red oak I got from Lowe's, glassed over with thin light weight cloth and epoxy resin, but red oak is not the best choice of wood, if you can find white oak, mahogany, or ash would be much better.
After sand from hitting bottom it wore off some fiberglass and water seeped into wood. Intensity sails has wood and composite blades and tiller and sail for a fraction of the cost of original. The sail is right at $100 , the blades are less than $200 each, even the composites, I would check out their website, compair price against good wood and your labor of cutting, sanding, finishing homemade to intensity sails price. Hugh