Anyone here have one? If so what size, brand and other info would be great. I am looking into either a 12'x30" or 15'x48". Metal framed. Problem is, where it would sit. It would be half on concrete and half on grass. The concrete patio is sloped away from the house and the grass slopes into the concrete patio, basically creating a "V" to which would be the middle of the pool. I can build a wood deck which would be perfectly level, or do I even need to? Any help or comments?