Unless you "must have" the wood look, you would be better off making it out of AZEEK board. It comes in lumber widths and lengths and is ultra strong. You can shape it with a router, a plane or sandpaper. Natural color is white. I made a split unit, putting in a port window which has a screen in the upper unit. naturally you'll have to shape the butting edges to make the water run off. Its cheaper and lighter than Starboard.