Understanding what Gang of Four pattern I would use to build this relationship of objects

I am trying to understand how I could create and parse my object (which will be turned into a binary format, for this example). I am not entirely sure what this relationship is called, nor what GoF pattern I would use appropriately to build said object (builder, factory, abstract factory..?)

Here is an example of my problem. The critical example is my car analogy.

/*
 * class 'Model' would essentially be the main object for my binary format (for our sake, let's refer to this by its pseudoextension: '.gm'
 * It is completely dependent on having Geometry, but Collision and Lights are optional.
 *
 * Essentially, models are dependent on having X objects, and those X objects are completely dependent on having a Model object (needs a parent).
 *
 * Think of it like a car. You need an engine to have a car. Without an engine, your car is useless. On the other hand, if you have an engine without a car, it is also useless.
 * However, this engine can be put in a car to be made useful.
 */
class Model { 
    const char *name;
    Geometry *geometries[16];
    Collision *collision;
    Light *lights[16];
}

/*
 * This class is essentially just a Vertex and Index buffer. On its own, it is useless. It needs to be encapsulated by a 'Model' to have a purpose.
 */
class Geometry {        
    VertexBuffer *vertexBuffer;
    IndexBuffer *indexBuffer;
    unsigned int VertexMask;
    // ...
}

/*
 * Like geometry, it is also useless on its own.
 */
class Collision {
    // ...
}

/*
 * Like geometry, it is also useless on its own.
 */
class Light {
    // ...
}

Thanks.