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I always have a thwart board seat (no seatback) to use as an optional assessory in my boat. The dimensions of the board is 60 inches long by 15 inches wide by 5/4 inches thick, solid mahogany. If you cut the 60 inch length precisely and straight, the board will torsion fit into the thwart channels and you do not need to screw it down to the interior hull. The utility of the 60 inch board is that I can install it in the transom area where up to 3 persons can sit on it, or in front of the console and use it as either a seat or a standing platform for casting. I can remove it easily if I do not need it; it weights @29 lbs and does not need/have a center floor support. The 5/4 thick solid mahogany is strong enough to hold considerable weight.