So, to add everything together:
- Model has to be Triangles
- Only one Texture per Model
- Model has to be MD3 and Texture has to be PNG
- Model and Texture must have the same name
- There has to be a Decoration with the same Name
- In the Free Version you have to modify the Models.dat
- for example: Name Name 0 0 0 0 0 1 1 1 1 500 1 1