Im tearing down an old camper to get to the undercarriage. On top of this Ive built a small home. 6,7sqm with a bed and a small loft. Theres also a small stove for heating and cooking and also baking. The walls are insulated with ecofiber 7cm thick. The roof and floor 10 cm thick. The total weight was a concern otherwise I would have gone for thicker insulation all around. We have actuallty lived three people in it for a week and two people for much longer.