Can I import my own models into GameGuru?

Yes, you will find an option called Import Model in the FILE menu which you can use to specify a DirectX X model file (.x) which will then be loaded into a simple entity configuration screen which will allow you set some basic attributes of the model before it is converted into an entity which can then be used in GameGuru. The successfully imported model can be found in the entitybank\user folder once complete.  You also have limited support for static FBX files, though the range of variants for this format does not guarantee the best import process.