This machine was fabricated in our own workshop.

Operated : (of a person) control the functioning of (a machine, process, or system).
Constructed : build or make (something, typically a building, road, or machine).
Installed : place or fix (equipment or machinery) in position ready for use.
Manufactured : make (something) on a large scale using machinery.
Fabricated : construct or manufacture (an industrial product), especially from prepared components.

Synonym of Fabricated is Manufactured