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Don't take the crit masteries ( Lethality , Frenzy unless you have crit items.

You should trade in the Wriggle's Lantern late game for Guardian Angel, and take Ravenous Hydra early on. It boosts clear speed, sustain, and split-pushing. You should also list Mercury's Treads as an optional item, as tenacity helps a champ who like diving into the middle of their whole team.

For chapters, start with Pros/Cons, move onto runes, masteries, then spells, etc. Everything that happens pre-game, (in the lobby).

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Awesome, That would also give him a bit more teamfighting power. I'll try it next time I get that far in a game without the enemy team surrendering (not often). Speaking of which, I'm gonna try and upload a more recent LOL Replay of Nocturne in action.

yeah i think Locket of the Iron Solari will really even out the build

I might try replacing Black Cleaver with Locket of the Iron Solari or Randuin's omen then.

sure its good to have a lot of HP but its useless with no armor and magic resist, it will be burst down so quickly it won't make much of a difference.

So, I am thinking about replacing the Atma's Impaler in the build with something else. I was wondering if anyone had suggestions. The goal is to make him more helpful in team fights, so an aura item like zeke's herald or something might work out well.

I'll be doing a revision soon and will put that in there. For me it's mostly just a comfort thing, I like using flash to catch weak people and escape strong ones.

Can and will you write a section on why you chose flash over other summoner spells?

Also, I've been contemplating replacing the Infinity Edge at the end with Bloodthirster. At full stack it would give more AD and tons of life steal. I haven't made it far enough in a game to test this out though. Hopefully I will get to soon.

That's a good point, if not in dire need of the phage then the avarice would speed up the build process. Also, thanks for trying out the build, I'm definitely gonna watch the game with lunch today and see how it went.

Awesome guide. Here's the second game I used with this build and I went 15/2/3. Also note I am level 24 and still new to the game.
http://www.leaguereplays.com/replays/match/2688085/
I tried getting avarice before building a phage/frozen mallet because the extra gold can help out. Building it vs will give you extra gold+some critical strike chance while building a phage later than you need to, and you can just build the avarice into atma. I recommend this if you're not terribly losing and don't need the extra 200 health right away.