I've gone over the ad and photos till I believe I can build the bench sections, but I am unclear on how to go about building the corner section. I've got the sizes they would use but I would have to adjust the height to fit under the kitchen window. It's a matter of about 3 1/2 inches to the back of the bench. But the corner section, I can't quite figure out how to build it. Any ideas? Also, I want to add shelves to the back of the short bench and corner back that will be open to the kitchen.