... want to make gadgets, your best bet is to use a released build. Just download and run the latest released installer, then run aardvarkxr.exe from the install directory. Once you've installed you can also enable Aardvark to start automatically in the Startup/Shutdown settings in SteamVR. Aardvark is made up of "gadgets". These are 3D objects that do something useful, something fun, or maybe they just look cool.