A BCD is a complex piece of diving equipment that is very labour intensive to make. Whilst machines and presses can cut much of the patterns from the materials each BCD requires a lot stitching to fix straps, components and accessories to the BCD to ensure the bond is strong and durable.
This video walks you through many of the stages involves with the assemble of a BCD and will give you an idea of the hard work that goes into the design and making of a BCD.