Another option is to use regular closed-cell foam insulation and then laminate mylar "space blanket" to the inner surface to provide additional insulation. I'd point out that most of the plastic/foam insulation will produce toxic fumes if burned. Cork is a better choice if you want to avoid toxic fumes. Aerogel is a good insulator, but expensive and difficult to work with.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.