Hiiiii
I remember this model, it was wonderful, when I was a child, for my birthday my parents buy me the U-Boot VII - C , the model of Gunter Prien, it was opended and you can see all the machines, the torpedo camera.
Was perfect. Now I have other models, but I'm not make it, not free time for it, maybe into a few years. It's a plastic models and it is eternal.