The Trac 16 mainsail is a fully battened sail, but it was acquired sans battens. I’m currently using some 1.50″ x .25″ straight-grained pine lattice stock I found at Home Depot to make a set. The stuff is really stiff, which is good for the top batten, but not for the rest. I’ve been attempting to taper them with a palm sander, with some success, but it’s taking a while. I suspect that I’ll be picking up a small plane (a carpenter’s plane, not a Cessna) to assist in the tapering, and that I’ll rip them on the table saw to a 1.00″ width (if needed) to gain flexibility. I’ll also be looking for some PVC lattice stock.
It’s too bad real yachty-type batten stock is so expensive… then again, I’ll likely end up spending just as much in the end attempting to make my own. At least I’ll have the knowledge gained by testing!