Sure thing, here’s a quick sketch that keeps the material bill light, sticks to natural options, and can be built fast enough for a group in the field. I’ll break it into the core parts, the rough amount of stuff each needs, and how each will hold up against fire and weather. **1. Frame / support** - **Material**: 2–3 fallen branches, each 2–3 m long, plus a handful of small, flexible twigs for cross‑bracing. - **Resource cost**: about 6–9 m of wood total; you’ll have to pick only when the branch is already fallen to avoid cutting trees. - **Performance**: solid enough to keep the roof from sagging, and if you lay the logs in a cross pattern you’ll get a decent wind‑break. Fire‑wise it’s only a concern if the branch is charred, but you can treat the outer surface with a quick ash wash to slow ignition. **2. Insulation & wall panels** - **Material**: large sheets of bark (bark from the outer 5 cm of a tree, peeled by hand) or packed leaf‑moss bundles. - **Resource cost**: 4–6 large bark sheets (each about 1 m²) or about 2 kg of leaf‑moss. - **Performance**: bark is water‑repellent when unpainted and gives good thermal resistance; moss keeps out drafts and adds a layer of insulation. In a fire, bark will char slowly if you keep it dry, but moss can smolder, so keep a firebreak of dry leaves between the walls and any open fire source. **3. Rain cover / roof** - **Material**: a large, flat, waterproof leaf (like a pine or spruce needle layer), laid over the frame and secured with small stones or weighted twigs. - **Resource cost**: 1–2 m² of overlapping leaves plus a handful of flat stones to hold it in place. - **Performance**: leaves repel water when layered tight; the stones keep it from shifting in wind. Fire‑wise, leaves burn quickly, so you’ll want a dry fire‑break around the perimeter if you plan any cooking or campfire. **4. Ventilation** - **Material**: a few short twigs cut into a V‑shaped notch in the wall and a small, loose bundle of bark placed over it. - **Resource cost**: 0.5 m of twigs, a bark piece that’s a couple of centimeters thick. - **Performance**: allows smoke to escape while keeping rain out; the bark layer keeps moisture from seeping in. No fire risk because it’s a small opening, but keep it clear of wet material. **5. Fire safety & ground preparation** - **Material**: clear a patch of 2 m × 2 m, remove all dry vegetation, lay a ring of smooth stones around the shelter. - **Resource cost**: 4–6 stones (any size that fits comfortably around the perimeter). - **Performance**: the stone ring stops fire from spreading under the shelter; the cleared ground keeps damp air from creeping in and reduces humidity. **Quick build outline** 1. Find your fallen branches and set them up in a simple A‑shaped frame. 2. Line the walls with bark sheets or moss bundles. 3. Lay the leaf layer over the roof, secure with stones. 4. Carve a V‑vent in one wall, place bark cover over it. 5. Clear the ground and place stones around the perimeter. **Why this works** - Uses only what the forest gives you without cutting trees. - Each component can be assembled in under an hour if the group works together. - The materials are largely water‑resistant and only burn slowly if kept dry. - The stone ring and cleared ground act as a simple firebreak. That’s the minimal, low‑impact plan. If you need a bit more insulation, just double the bark layer or add a thicker moss blanket; for extra fire protection, keep a bucket of water close by and avoid cooking directly under the shelter. Good luck, and may the wind always be on your side.

Sounds like a solid outline. Just a couple of quick tweaks: keep a small container of water right outside the stone ring for quick dousing if the leaf layer starts to flare. And if you can, gather a few extra flat bark pieces that are slightly damp—lay them over the roof before you set the stones to give a little extra moisture barrier. That way the leaf layer has a bit of protection until you get the water handy. Also, a quick check of the wind direction before you finish the frame can help you position the A‑shape so the wind pushes against the outer walls, keeping the interior cooler. Good luck, and enjoy the calm of a shelter built by nature itself.