Commendable work. It's not a far cry from his current appearance, more like a development. I love how you tried to make sense of his abilities. I always thought if Cho'Gath could launch spines, you should be able to see them –it'd a nice tell to an opponent of what he's capable of, something Riot tries to enforce, and could be visually stimulating if pulled off right (imagine every time you toggle it, the spines rise or fall ala Battlecast Cho's rocket bays). I also like how you made a visual connection between Cho himself and his Q area; another thing his Battlecast skin does well.
But there's something about him I find ugly. He's not meant to be a debonair by any means, sure, but there's something that stops me from appreciating it further. I think it's the spines. Adding them was an improvement, but I'm a sucker for uniformity. For comparison, Kha'Zix is neatly-wrapped package and his spine racks are crisp and clean. They seem natural and complement his whole get-up. Your spines on Cho'Gath, not to speak ill of your work, look abnormal against his purple chitin. They look like unnatural growths, as if they're growing off him and not a part of him. But to make a complement sandwich, making the Vorpal Spines launch from his "scythe" arms is a nice touch. Adds some actual functionality to them; they're way too short to stab people that aren't already in his arm's reach.