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OP here,
I'm happy to see posted some ideas for the design !
I'll try to post some ideas for the design I'm thinking of, but I'll keep it very simple.
BTW, I've read somewhere that a "heat trap" was a good idea to include. Do you guys have any idea what it could be ? I'm guessing it's a wall separating the entry from the "living" part of the cache. Maybe it's a square hole under the hatch so the cold air gets trapped there ?
Anyways, thanks for the advices, keep them coming !