Engineering project creep or change of project direction can be common in engineering.
A single use piece of inhouse workshop test equipment can become a project deliverable to enable the client to have similar equipment manufactured. Or a client that doesn't need documented schematics can easily change into a project requirement as the client understands the full value of system documentation.
Teptronic's documentation service is a 'reverse engineering' service, taking your existing proven system and creating the missing technical documents which would normal have been developed in the early days of the project.