It's looking good! I'd love to see all your specs in a signature. I think your extra ground supports (not sure what you call them) deserves a mention. That could be very helpful to someone down the road. And, a link to your build. Use my signature or others for an example.
Almost forgot - great call on the design change. I love it will be longer now!
Remember my builder focuses a lot on commercial and they build things "overkill" so you know you will never have issues.
From what I know, there were some "minor" worries about my build.
For starters I live on 5 acres and have a creek in the far back of the property. In heavy floods the water will fill up over the creek but never getting close to the house.
Well, we had some SERIOUS 500 year type floods last year and the water rose to levels it has never rose to before. It got within 1 ft. of my current patio.
MY PB lives in my neighborhood, so there are a combination of things. Knowing the water got within 1 ft. of my patio is why he wanted to bring in really solid clay to level the area were the pool would go and let that sit for 1 month before we dig. He wanted to do this to ensure no "flood water" could find its way under my pool. Sort of like building a "berm".
Second, my area, specifically my neighborhood, has been known to have ground water really close to the surface. We didn't hit any ground water during the dig but we still took the "better safe than sorry" approach.
He decided to dig the 8 deep holes in the pool and rebar those holes just incase I ever do get ground water and something tries to settle that my pool is strong enough to withstand.
Lastly, if you look at some of the rebar pictures above you will notice rebar sticking straight up and sort of a upside down J look. The idea behind that is once gunite is shot, and we are ready to pour decking my PB will bend those to set under the newly poured decking. By doing this now that ties my pool to my decking for an extra layer of support.