Create the stanchions across the aft end of the boat deck, using similar methods. The slope of the stanchions in this case will be the same as the slope of the visor surface. There will be no inboard slope to these stanchions. Make the spacing between them equal and approximately the same 5 feet as the side stanchions. Just like you did with the side stanchions, create a "phantom stanchion" outboard of the sheer.