Cool, check out these specs on creating your own 5000 litre rain water harvesting storage tank! Nicely detailed material list and instructions. These tanks look easy to make and are a lot less expensive than buying one and having it delivered and installed (ouch). It seems easier to just build the tank in place than to have to lug that giant tank to wherever you wanted to install it. I have seen other sites and books on how to make these tanks very artistic and stylish instead of cylindrical like this one. If I run across those links again, I will post them here.
