BR has fender board similar to the one Dog described in his link above -- 2" x 8" x 8', except we didn't bother with using PT wood. We've sailed 25,000 miles with the fender board lashed to the rail on the stbd bow -- we've used it twice.
After all those miles our board has a nice silvery patina, is very soft to the touch and, most importantly, it contributes to BR's "look" as a serious crusing sailboat -- just what you want in a fender board.
PS. It also is very good at trapping dirt in the scuppers.
PPS. If you double click on the avatar you can see it there on the stbd rail. Very 'salty', eh?