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Since you're new to guide writing, you should check out the BBCode Wiki or jhoijhoi's Guide to Making A Guide. The reason is that you added images probably from the wiki even though Mobafire has its own database which you can use via BBCode.
In regards to your build, it is quite greedy what you recommend. I wouldn't buy Mejai's Soulstealer unless my whole team is fed and even then I would rather buy Zeke's Harbinger.
Moreover, I wouldn't recommend Rylai's Crystal Scepter. Your ultimate slows after the knockup, your e is a buff which makes auto attacks slow, your q stuns longer than the slow duration and your passive grants you and your allies 60 and more (depending on your AP) movement speed. AP and health is ok but not worth on Nami.
Morellonomicon is very greedy because essentially you delay other important items, which makes you unflexible, a big problem for a support. Reactive builds are better. Furthermore, you will overcap your cooldown reduction. Your build gives you 50% cdr and you can only get 45%. Your build should only give 40% cdr since 5% are taken away by Intelligence .
Other things that are questionable are Abyssal Mask and Guardian Angel. They do not help you a lot. Guardian Angel does not protect you from poor positioning, which will kill you regardless of GA's passive. Abyssal is a late game item and I would only recommend it if there 3 AP sources on your team and even then it's just bad for the price and on a support like Nami.
Banshee's Veil helps you more and gives more magic resist.
One item you forgot is Mikael's Blessing. It's more situational but not a niche item. The item gives you and your team a free cleanse. That's very powerful and I recommend putting it into Situational Items.
Ability power glyphs are extremely greedy and will hurt your laning phase unless you play all the time against tanks. Champions like Zyra or Vel'Koz do tons of magic damage. Flat magic resist helps against the early game damage and even later.
Also, armor seals are better because you do not have that much health in the early game which makes them more effective. Marks of precision is questionable because you do not deal much physical damage at every stage of the game.