Hey, rkb. A couple observations based on our mistakes. First the "sunning deck" you mentioned. If that is the flat shallow 6-8" section of pool that people call a sun shelf, Baja shelf or the like, then fwiw I consider that one of the dumbest things we let our pool builder convince us we needed. Besides the health risks from sunbathing, it's part of the pool that our robot can't clean (too shallow) and most of the time it's just a shallow place on the way to the steps down into the pool. Starting again, I'd put steps all the way across the shallow end instead of the sun shelf. Steps give people a place to sit in the pool at various depths--and having the steps across the whole end of the pool leaves room for sitting without blocking the steps.
Next, deep end. Our pool builder suggested 5 feet deep end. My wife wanted six feet, so that's what we got. A lot of people want to stand in the pool, but not many can stand in six feet of water (or play water volleyball, for example), yet 6 feet is way too shallow for diving, so what good is it? Finally, we have a pool that one end is a stupid 8" deep wading shelf and the other end is too deep to stand, and our 40 foot long pool is only 100% usable for the center 20 feet. I would also prefer a shallower deep end in case I need to rescue a kid or someone else, as I'd like to be able to stand on the bottom during the rescue. You're building a fairly small pool, so be sure you're going to be able to use it all. Just one opinion from someone who has built one pool and would do it differently now--but probably won't ever build a pool again.