Finally, don't cheat. You'll discover that foil sections are thicker than you imagine. That's OK, because a proper foil shape has much less drag than you think looking at it. The thicker the foil, the more lift it will give you. The drag also increases as the foils get thicker, but you can't really separate drag and lift.
Symmetrical foils are by far the easiest to make by hand.
If you have access to CAD-CAM machinery by all means go nuts. There is nothing magic about this. 5 to 10 degrees from center, a NACA foil will be effective over maybe twice that range. Your boat's rudder will work better. Tacking will be easier.