Think about your kitchen design from an overhead view. Corridor or straight wall kitchens have no corners. Kitchens that are L shaped have a single corner. U shaped kitchens have 2 corners. Make a general drawing of the type of layout for your kitchen and the length of each segment. Measure the ceiling height and make a note of any soffits and their dimensions. Soffits are the box shaped drop down areas that meet the cabinet tops. They are generally around 12” tall and 12”-15” deep. Most commonly they are 7 feet above the floor. Soffits may be empty and removable or full of wires, duct work, etc. and be permanent.