Parkdale has recently been repainted, but I think the old station building/signal box at the down end of platform 1 is in the process of being refurbished as the PSO box. An air-conditioning unit has been installed outside the building along with new power connections. Also, the windows have been replaced with new tinted glass. It certainly looks like PSO's will be moving into Parkdale soon. But in most cases PSO boxes are being built to a generic design as a separate building - guess it is on a case by case basis. If there is an area inside existing station buildings for a PSO room to be built, it will be built inside the station building. In some locations the PSO boxes have been built but made to blend in with the station surroundings. The box at Clayton has been repainted in station colours, and the box at Mentone has been covered in fake weatherboards and then painted in station colours.