DPS cho is the only way to go.

Replace Frozen Mallet with Rylai's Crystal Scepter. It boosts all of your abilities and survivability and Vorpal Spikes procs it. It's superior to Frozen Mallet in every way. Malady is also a very poor choice, there are much better items for doing more damage. Something like Will of the Ancients would prove more useful for both you and your team.

Yes, totally unbeliable!

Malady is bad. Frozen Mallet is bad. You're going hybrid on a champ that isn't suited for physical DPS.

There is no early durability hear, literaly none. In early game you will get ripped apart by competition, AD Cho'Gath does not work that well, I would replace the Frozen Mallet with Rylai's Crystal Scepter. And if I were you I would replace Malady with the Rod of Ages. But that is just how I play Cho gath... I am not going to up or downvote this because I think this is more of a mage Cho guide via the runes and masteries therfore I would even switch out Frozen Heart with Archangels Staff or a Zhoynia's Hourglass Just my imput on this guide.

Your guide is a wall of text this is how you can make pictures
How to make images:
{{Cloth Armor}} That is with shift on the bars (they are the square ones).

Did you try it? If not, I don't appreciate the downvote...

Never should you ever get a Malady. Get an Abyssal if you want to lower magic resistence or ever have fiddles in your lane. but malady is just waste of money for him. Try fixing this build and then ill think about up voting but this is terrible in my opinion.