Hello Mr. Sternbauer,
You can import obj-files for building the composed object. The point here is that you demonstrate how to handle the matrix manipulations when animating parts of the objects. In contrast, the hand-crafted object should not be created via modeling tools like Blender because this part is about demonstrating that you are able to create a single object with the correct properties (i.e., normals that are needed for the shading). I tried to clarify this by slightly extending the description on the moodle page:
Hand-crafted object
Create one scene graph node that renders a hand-crafted 3D shape (5-25 vertices; not a cube, sphere, quad, or loaded model). Fully specify properties for this object, i.e., vertices, normals, and texture coordinates. This object must not be imported from external object files created via modeling tools like Blender. However, you are free to use imported objects for other parts of your scene.
Best regards,
Marc Streit