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Editing and manipulating graph-based models within immersive environments is largely unexplored and certain design activities could benefit from using those technologies. For example, in the case study of architectural modelling, the 3D context of Virtual Reality naturally matches the intended output product, i.e. a 3D architectural geometry. Since both the state of the art and the state of the practice are lacking, we explore the field of VR-based interactive modelling, and provide insights as to how to implement proper interactions in that context, with broadly available devices. We consequently produce several open-source software prototypes for manipulating graph-based models in VR.