Yeah- the window not being rated for the depth seems like a major problem. I’m not sure about the construction, I have been traveling and not paying much attention to the news but I heard carbon fiber… which I suppose is fine, but I’d imagine like other machines you have to have thorough durability testing and a verified inspection process. Much like an airplane I would think your hull would have a limited number of pressurization cycles so to speak. I’m not sure why you’d go with a novel material when materials like steel are tried and tested.