This Architectural Drawing is AutoCAD 2d drawing of Key plan and foundation layout in AutoCAD, dwg file. Key Plans are floor plans showing primary architectural elements of each building by floor level. They graphically represent walls, doors, windows, room numbers, and other feature. Layout of foundation plan. Layout of foundation plan : After determining the width and depth of foundation, a drawing showing the width of foundations of various walls is prepared. It is known as foundation plan.