Corrugated steel is an often overlooked building material, particularly for tiny houses: http://2.bp.blogspot.com/-Z4MwyfNR-Ek/TbNYZHvul_I/AAAAAAAAY50/6lPgfLMF

Corrugated steel is an often overlooked building material, particularly for tiny houses: http://2.bp.blogspot.com/-Z4MwyfNR-Ek/TbNYZHvul_I/AAAAAAAAY50/6lPgfLMFfUs/s1600/P1000286+%255B1024x768%255D.JPG http://2.bp.blogspot.com/-Z4MwyfNR-Ek/TbNYZHvul_I/AAAAAAAAY5... Photo taken in Chloride, AZ. Many of the small homes in the town have their original iron siding and are well over 100 years old. This book has more information: http://www.amazon.com/Corrugated-Iron-Simon-Holloway-Mornement/dp/0711226547/ref=sr_1_1?ie=UTF8&qid=1378773939&sr=8-1&keywords=corrugated+iron http://www.amazon.com/Corrugated-Iron-Simon-Holloway-Morneme...