From Islands to hotels and treehouses , ideal homes from waste materials . Beer cans , hubcaps and window frames provide much of the raw material for four separate buildings , with four floors in the largest . Madrid Cathedral built single-handed from scrap over 50 years by ex-monk . Comment: British project based on thousands of toothbrushes and videotapes .
From Islands to hotels and treehouses , ideal homes from waste materials . Madrid Cathedral built single-handed from scrap over 50 years by ex-monk . Comment: British project based on thousands of toothbrushes and videotapes .