Your build is fine, but with all that survivability, you can't really do anything other than having your turrets inflict their debuffs. Without magic pen or a really high AP value (400+), you'll find your damage to be only subpar.
Zonya's usually can force you to win against anyone who tries to jump you as long as your turrets are nearby. With it, you can sacrifice a lot of your tanky items for pure damage ones, like Liandry's Torment or Rabadon's Deathcap. As far as tanky items go, focus on your turrets and spells, so Rylai's, Zonya's and (as you mentioned before) Runic Bulwark.
Do keep in mind, your turrets do not proc Liandry's. This is no problem, though, since you consistently hit with your missiles (if you know how to make them work correctly), and consistency is the most important thing about Liandry's, which is doubly effective when combined with Rylai's. The additional magic penetration, in combination with your high AP, will make you a force to be reckoned with. Just make sure to stick behind your team and rely on Zonya's to survive and you'll do great.
Sorc. Boots, Zonya's, Archangel's, Liandry's, Rabadon's, Rylai's.
I find that I don't need Archangel's if I take either Teleport (works well with turrets, and gives you more mana sustain) or Clarity (more sustain than teleport, but obviously less mobile).