Boat Builder Bob Emser demonstrates how to build a boat grate. Generally grates are used on the sole of a yacht, the walnut grate in this case is designed as a aft hatch for the Haven 12 1/2. The detailed crosshatching of wood in a beautiful lattice pattern can be quite challenging. Follow along as Bob shows how he designed and constructed the aft hatch. In addition the seat for the boat are secured by using a classic Herreshoff method.