LR window seat inspiration--but with thick cushion. (Note how backrest plane and then seat plane expand overall width without having to thicken the wall.) Napa Valley House by Steven Harris Architecture (Architect: Eliot Lee)
why not take the LACK shelf and flip it, so the shelf side is facing into the room? You might need to get a little creative with the mounting hardware, but this is a great way to create some semi-concealed storage and reduce visual clutter.