I am installing an Intex 16x32x52" rectangular pool. For some strange reason building supply stores in Western Canada do not sell 16x16x4" pavers so I am going to make my own pavers. My crushed base and insulating foam are 3 inches high, so I was thinking that 3.5 inch pavers (from a 2x4 frame) would work ok (rebar reinforced), but what length and width is needed? I assume that people use 16x16" because that is the size they can get at the store. Making them myself they can be smaller (and use less cement) but I don't want them to be too small. Any size suggestions?