In order to realize the characteristic timber eave ceiling of a training facility, we rationalized the shape for fabrication, studied on subdivision of wooden louvers, created unrolled drawing for the fabrication study, and supported the detail study of the substructure steel frame in 3D model. Parametric modeling was used to support the study of the subdivision and parts layout on material. In this process, we took balance between constraints of fabrication and the design intention as much as possible. In addition, in order to create a smooth curved surface shape with a steel substructure, we communicated with the production designer using sketches and 3D models to realize the 3D joints that appear in various places. We also created 3D PDF for instruction drawings which helps production work at the factory.