The Monitor vane is made from corrugated polycarbonate - looks like corrugated cardboard but very strong and flexible. Seems like a better option than plywood.
Back in the water in Grenada - with new main and #2 and cockpit canvas (Santa came early). Will spend the winter and early spring in the Caribbean and then head to Bermuda and the northeast US. Still trying to decide if we will bring the boat to Canada, either in 2015 or 2016.