I follow from time to time this guys site on his boat build. Some real fine woodworking he does.
Wish i had touched base on this site before Allen built his corner bench. There is an idea here for the junction between two sides of a bench like his.
Take a look Allen
he used it in his corner for the forward step, my thoughts on seeing it were surely one could use this idea on an angle like a window bench corner? Then the sides would automatically come together no? Just the back would be one large panel
Here is the home page for those interested.
Enjoy. I would love to see this boat enter the water and be on it for a ride.