The biggest challenge in the bush in Australia without air conditioning is keeping cool in summer. Step one – build a big sun shade. Insects eat wood, wood catches fire. Answer – make it in metal. The roof is made in 3m x 3m sections, each is removable. I have only built a single section so far to test the design. The tin was recycled from another roof that no longer needed it. This is the biggest meccano set I have ever had.