Thank you, and yeah. I realized those errors after I played a few more games with him, however I havent had the time to get around to fixing the guide.

Honestly, if you build him like an AD Carry for runes and masteries, using AD marks and quints, you can start with a Doran's blade and jungle effectively. Yes, it sounds absurd, but a blue leash and leveling W at 2 will allow you to clear the entire jungle with amazing speed without having to go back as well.

Personally, getting 2 Doran's blades, then your boots, then building a Brutalizer and then Merc Treads is pretty much a core starting point. After that, you can branch out into going full-AD which all AD Casters are pretty much required to do to not suck for damage. :/

For one, you do NOT need to build Frozen Mallet, as it's a waste of space. His passive already has a slow with extra damage, and you're not going to be auto attacking unless your opponent is standing there brawling it out with you, which the mallet won't help anyways as the slow won't do anything. 700 health won't save you, while losing that 60 AD will make it take many more attacks to kill anyone you're fighting

Phantom Dancer is unnecessary as, again, you won't be auto attacking that often with his 3.5sec Q. It's a pointless item that gives him absolutely no AD. Waste of space.

Optimally, a solid build would be boots, 4 Bloodthirsters, and Last Whisper.

Infinity Edge costs much more than a Bloodthister for the same AD, and with 25% crit chance it's not worth it to buy unless you were to instead upgrade your Brutalizer into a Yomuu's instead of getting Last Whisper (which if most of the other team isn't building any armor then LW isn't really needed), then you could swap out a Bloodthister for an Infinity Edge as Yomuu's crit chance will be significant enough for it to count in the build.

You've got a good grasp of it, though. Expect an upvote when we're allowed.

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...tl;dr
Build 1: Mercury's Treads Bloodthirster Bloodthirster Last Whisper Bloodthirster Bloodthirster
Build 2: Mercury's Treads Bloodthirster Infinity Edge Youmuu's Ghostblade Bloodthirster Bloodthirster

I love it, I used this build and went 16/7. Thanks Tschomb!

Please comment as to what you like/dislike, and what you think I can do to make this better.