As the writer of the only other paladin build guide on the site, I love to see new ones come out! I do have some recommendations that would make the build perform much better.
You're missing out on a lot of hybrid health affixes (probably the strongest affix in the game atm) in your belt, boots, and gloves. Since two of these compete with cdr which is super beneficial for volatile reversal we basically want those in every slot we can. That'll shoot your health up dramatically which is our biggest protection against one shots.
You also didn't specify any blessings to get, which could open up some affixes on your build for better used stats or endurance % to reach cap.
The final note is to amp your damage much higher you'll definitely want a crystal wand which provides mana and can roll elemental damage over time and damage over time. The wand alone will spike your damage by about 40-60% based on the affix tiers because of the added flat damage.