You knew that Valve was going to support modding for its Index VR headset when it included a "frunk" just for accessories, but now the company is offering some of the tools you need to make those mods. It's releasing CAD files that can help you model accessories for the headset itself, the base station and the controllers. They're not just basic blueprints -- there are "inclusion zone" models to help you avoid interfering with sensors, and sample accessories give you an idea of what's possible.