My research for Penmaenpool a few years ago could include several features for your layout as it was also built by the Cambrian and later incorporated into the GWR. The station building was the station master’s house with a small booking office and waiting room attached. It is now the annex for the nearby hotel. The timber platforms had only the later GWR signal box and two simple shelters. The goods yard was as basic as they come, a small corrugated iron store with loading platform on the single siding. What Penmaenpool also had was a two road engine shed and adjacent house for the foreman, only there because it was as far as the Cambrian had built their line at the time. It would have made more sense to have the shed at Dolgelley but instead there was the opportunity for light engine running morning and night! Fair to say that the Cambrian was quirky so lots of room for Rule 1.