-- Last Updated: Mar-24-13 10:14 AM EST --
I second the idea of plastic. Press board or plywood won't hold up for long, unless it's sealed with varnish, or something. Sometimes when I need pastic stock, I go to Wally World, and buy a portable cutting board. They're pretty cheap, and come in at least 2 thicknesses. fThe thicker HDPE stuff is too thick, but cuts and drills great, for certain types of projects.
Not that you want to get this involved, but, for reference, when I built a skeg system for my last wood kayak, I used 5.2mm plywood, and fiberglassed both sides. The whole thing is sealed with epoxy and varnish.
Now that this has come up, I'm wondering why I didn't investigate plastic. Eh, looks, I guess.
WRT tracking not being very good... that may depend on the river and the goal. People may complain about tracking when they can't get a boat to go straight on flat, still water. But, not tracking well is considered a virtue for whitewater boats, with moving current, and not primarily motivating the boat with the paddle.
Edit: Another source of plastic stock is clipboards, from an office supply store.
Reflective Hull Decals
Hardshell Kayak Sail Rigs
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