Hello. First time pool owner, here. We will be having a 16 x 28 ft Doughboy pool with expandable liner sunk into our backyard soon. We think we want a "sports pool", 3 1/2 ft of water on one end, 4ft of water opposite and a 7ft deep center. PB said it will have to remain above ground by 12 inches or so to prevent unwanted water flowing into pool. Seems reasonable. We have wedding cake steps to enter and exit pool at the shallowest end. We would like to use the ladder that came with kit to exit the center of pool, however there is no deck. What we do have is a 3 ft 10 inch long, 2 ft wide, 3 inch thick, 293 pound concrete block laying around. Safe to place ladder in pool with other end attached to block somehow and leave up against pool side? Any and all advice is appreciated.