Nice idea, but you gotta keep that heat away. Build a thick, reinforced concrete core for the main shelter, then line it with a heat‑reflective coating. Install a venting system to blow ash out before it settles. Add a thermal shield fence around the perimeter so the outer walls don’t bake. And always have an escape route marked and tested—no one likes getting stuck in a lava‑kissed mess. You’ll be fine if you plan hard.