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it would be much better to do R-36 walls and R-36 ceiling etc...
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Close, but not quite there yet. You still distinguish between walls and ceiling. If they are 'inflated' to a hemispherical shape, the internal air currents will distribute and conserve the temperature differential versus the outside, before any consideration of layering insulation and thermal mass into it.
5V,12V, 120VAC and a buck converter to 400V for the car charger.