The structure itself would be 54ft (16.45m) long and 7ft (2.34m) wide and made up of seven modules made from coconut coir. A floating ecosystem, similar to the one pictured above, could be ...
Coco coir is fairly inexpensive and is available in compressed bricks that you add water to until it expands. Both perlite and vermiculite are available in bags from your local garden center.