A good fire reflector maximizes heat retention and minimizes fire wood usage. Also may deflect wind while sleeping. Kudos to the builder. I have a couple of references to fire reflectors in my novel "Obliterated-Would You Know How to Survive?
I saw this done at a festival in Scotland. The cordage did not sting. Find out how to make string from stinging nettles without getting stung! Nettle cordage can be used for lots of things, such as fishing line and shelter building.
Fish skin sewing "Salmon skin can be tougher than Gore-Tex or as soft as velvet. And everything you need to transform the scaly hide into a workable piece of clothing or art material can be found in your kitchen." My beautiful friend, Audrey!