Modified Corki ideas

I'd like to see some changes to Corki to make him look and do better in gameplay.

For my first one, I notice that Corki's missiles from both basic attacks and Missile Barrage Attacks would come out of the machine gun instead of the sides like how it is portrayed in other images. Looking at Lulu's Glitterlance, each bolt comes from Lulu and Pix. I think the same thing should happen with Missile Barrage only it shoots one missile at a time, following a pattern where the missile will come from one said of Corki's helicopter and then the other side on the next cast. Same with the basic attacks. I like Corki's rework animation to look like he's really releasing the missiles from his aircraft.

On Missile Barrage, I'd like Corki to have a lock on effect where in about 3 seconds, his basic attack target will be locked on for a homing launch attack for his missiles but make it still avoidable by making it lack steering like Sion's Unstoppable Onslaught.

His Phosphorus Bomb, I like the fact that it now has increased range but, the amount of range is still slightly not enough to actually fulfill that roll where he reveals enemies first before attacking. Anytime Corki would use Phosphorus Bomb, the enemy is still close enough to attack Corki first.

Valkyrie, it's mostly used to get in and out of fights but the fact that he could still be hit just doesn't make sense. Fizz's Playful/Trickster ability makes him untargetable but he's simply raising himself up high and at the same altitude as Corki when he uses Valkyrie. It wouldn't make sense that the same effect can't apply to Corki's Valkyrie. I think he shouldn't be targetable when he uses it.

Gatling Gun, I want the bullets to look like Jinx's Pow-Pow minigun bullets. Plus, I also want a different sound effect for the weapon. Make it sound like a real machine gun. Does the armor penetration effect increase? Does Last Whisper still buff this ability?

His passive? I'm not sure yet. How much true damage does it deal? 10% True damage? 10% of what? His attack damage? His ability power?

It's weird how Corki's helicopter wouldn't move faster than some of the heaviest champions in the game like Gragas or Malphite. Perhaps a slight bit of increased movement speed would make Corki's movement make a lot more sense.

So. . . what do you guys think? Would this make Corki overpowered or does this help him balance his gameplay? Plus, what do you guys think of the visual rework idea?