One of the things that I would do is require all piping under/around the pool, especially fittings, to be sch 80 PVC. I have had a few leaks through the years, and they can be a major PITA to fix. They are mostly caused from our gumbo-clay shrink/swell soil. Right now, since it is so dry, the soil shrinks as the moisture is cooked out. Then in the wet season it will absorb water and swell. This repeated action causes the piping to shift, and sometimes break. Sch 80 PVC, especially in the fittings, might save you from having to repair a cracked fitting in the near future.

Also, don't know if this is still done or not, but my pool had flex pvc installed in places like the skimmers and bottom drain. Stay away from PVC flex, it can't handle the chlorine. My skimmer return lines were flex and were completely choked/collapsed due to the chlorine "decay". Don't know how else to explain it.