When constructing a rainwater shower platform, there are several sustainable options and cost-effective alternatives to consider. The platform should be made of materials that are durable and can withstand outdoor elements, such as pressure-treated wood or composite decking. It is important to ensure that the platform has good drainage to avoid creating a muddy mess. Additionally, privacy screens can be made from PVC pipes and shower curtains. When choosing materials, it is important to consider the environmental impact and choose sustainable options, such as reclaimed wood or recycled plastic. Cost-effective alternatives include using cinder blocks or gravel as a base for the platform. Overall, the materials used for constructing a rainwater shower platform should be chosen with sustainability and cost-effectiveness in mind.