Hey, that’s a cool project! First off, keep the core of your shelter out of anything that could ignite—metal sheets, old cans, or even a big piece of plastic that’s been heat‑treated. Layer those on a sturdy frame so you’re not breathing in hot air from a fire in the distance. For warmth, use blankets, sleeping bags, or even an old mattress—just wrap them in a non‑flammable cover if you can. A small, controlled fire pit outside, a few meters away, will give you heat without risking the shelter. And remember, a fireproof shelter isn’t a fireproof blanket—keep that fire separate, keep your supplies away, and if you’re ever unsure, double check before you light anything. Stay cozy, stay safe.