I might have a cement tank project of my own coming up if I can work things out. I'm planning on building a small metal pole barn or one of those arched steel garage things for my back yard. And I know that in order to build it I need to pore a cement slap to put the building base on. So I was thinking if I'm going to have cement trucks come over and pore a slab for this building is it possible to have a wooden mold set up in the shape of a large fish tank for them to pore cement into an build a giant fish tank at the same time?