Here are a couple of pictures of a drop in rowing rig I made for a Hiawatha canoe. The design is primarily based on plans from the 1956 American Red Cross book on Canoeing. I altered the rowing rig by adding laminated out-rigger arms that are attached directly to the sliding seat frame, making it a complete drop in unit. Gripping rubber mat glued onto the bottom of the frame keeps it in place, no need to clamp it to the canoe or modify the canoe itself. Ash was used for most of the construction. The Hiawatha canoe, with it's long water line, flat bottom, and lack of center thwart which allows the space for the rowing rig, makes for a good rowing canoe. I am not currently building these for sale, but this is a good example of how versatile canoes can be with some accessories.