Personally, I build mallet, but after DFG+Abyssal+GA, you want hp, and rylais is pretty meh.

Good guide, but I would say that it's really not much of a guide and is more of a build, and you may wish to fix that. Also Warmogs on AP Cho?

Cheat Sheet: I don't see any flaws in your items, but the order is a little weird. You should wait until you get a couple of tank items before you get Oracle's Elixir, because if you die its kind of just a waste of gold, which you cant afford in beginning game lol. Your summoner spells, masteries, and runes look alright.

Guide: You need more cons, it just looks awkward for you to have so many pros and 1 con. Every champion has flaws even your favorite one lol. Just look for them and add them. Nobody plays the same way with every champion so you could add optional runes, masteries, items, etc. Your coding is alright but could be expanded on, don't be afraid to get a little more creative with it and out of your comfort zone. Go more in-depth with the gameplay of Cho'Gath and what his role is in teamfights.

Review: Overall nice guide, sometime was put into it but could use a little more. +1 for effort(:

+1!
You need to add some more chapters, work on the aesthetics and I have something to tell you:
Instead of downloading images and putting them in here(or I have a laggy computerr), you can write: You information is really good and you have a lovely ELO.

Made more colorful, I'll add more pictures tomorrow, and facts about Cho'Gath. I didn't really have time to show the range and how to always hit the skill shot almost 100% rate.

You need more sections, more color to your pros and cons, and more pictures take a look at these guides here
Getting started Guide

BBcoding Guide (AKA pictures)