Measuring Guide ... Openings
Now, lets turn our attention to any "openings" in the walls, ceiling, and the floor. (By openings we mean ... windows, doors, serving hatches, etc.)
Make notes on your kitchen plan outline showing the position and width of each of these items.
Example below:

All done? - Well lets now sort out those evil little items lurking about!
Measuring ... | Outline | Width | Height | Opening | Evil Items |