My model after a month. Most of the materials I have used found in recycle bin. The wooden angles are made from pine. Pine trees mature much faster then other trees and so are far more suitable for sustainable forestry, meaning that they can be chopped down for timber and another tree planted in its place. Aluminium is recyclable and as recycling does not damage the metal's structure, aluminium can be recycled indefinitely and still be used to produce any product. I sticked aluminium sheets to the angles using PVA glue which can be recycled as well.