Look at what you make, what kind of questions come back to the office from the factory floor when documentation is poor or non-existent. Template your documentation accordingly, there should be enough in there that staff don't need to ask questions, equally always foster an environment where they ask questions rather than make assumptions.
We used to create CAD drawings for everything, but for many things a nice set of photos, especially for the box build steps is much quicker to create. Make sure you have some form of version control and document changes.
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