About this 3D model

My school visualizer is made of cardboard, it is composed of different parts: - the first one is the body, this a cube of 15 * 15 * 5cm. - then the second part is the first arm, this part will be on the top of the body. - the 3rd part is the most important because this one will give you the right to the second arm to move at 180 °, if you need to show an other thing on the other side of the camera. - the fourth part is the second arm where will come the camera on. - and the last part is just a rod to substain the both arm togheter. And on the pictures does not match with the reality, it's just to get a better idea of ​​the prototype, and it's all made of cardboard