Awesome build and stunning Tank. I enjoy reading through the whole tread. About the ideas for a sun shade. Maybe you could go with those roller storm/hurricane panels they are motorized and came with different aesthetic looks to suit architectural integrity and won't be an eye sore. You can rolled down when needed by timers or manually even they can be integrated with house automation like alexa, Google ect. Its just another idea that came up that might help you. And also in winter you can place the insulation and roll down to secure in place.