Overall height measures how tall the aircraft is. The dimension is measured vertically between the underside of detal and the top plane of detal.
Width is the external width of the detal - measured horizontally between vertical planes of detal the outside faces.
• Centerlines and offsets
The centreline (CL)- a line through the centre of the hole is marked and the distances between the centrelines are given. Distances between centrelines are called centre-to-centre (c/c) dimensions. Centrelines are often used as reference points. These can be measured from, in order to locate -that is, give the position of- points on components.
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