Role Swapping Champ

I've had an idea for a champion that can switch between a tank and an assassin for a while now, and I feel my idea is pretty balanced. The champ (who I haven't come up with a name for yet so lets call him champ X) will have a battle suit that they can leave to switch between the two.

The suit would be his ult, and so they would be able to unlock his ult from beginning. Champ** X**'s ult allows him to leave the suit where it is, but it can't be left in spawn. The suit can be attacked and gives the equivalent gold and experience as a large jungle monster. The suit will also explode upon being destroyed, dealing 10% of X's maximum damage to all in range enemies. If champ X is inside the suit when it's destroyed, he takes 30-40-50% of his health as damage (increasing per level up of the ult). Champ X's ult also gives him a temporary attack speed boost upon leaving the suit, and allows him to teleport back to the suit after a 9-8-7 second delay (this is to encourage people to level up the ult). When the suit is destroyed, the ult will go on a cooldown for say 45-35-25 seconds, and when it comes off cooldown champ** X**'s suit will respawn where he is, and instantly re-enter it. This cooldwon will reset if champ X dies.

Champ** X** will also have a special bar that is sort of like a health bar, equal to his armor; instead of a mana bar or the likes. When he is in the suit all damage he takes will lower that bar instead (this won't actually lower his armor, it's just based off his armor). This will also be designed to be lower to Champ X's health in the beginning (that way you don't have to kill him twice). When he is out of his suit, he will take damage to his actual health bar, and the other bar will not do anything but slowly regenerate. Both bars will regenerate normally in spawn when champ X is in his suit, but only his health bar will regenerate if he is not in his suit.

Champ X will also have 2 special items specific for him, which he can only have one of the two at a time. One will increase his attack damage by half of his armor when out of the suit, while the other will increase his armor by half of his attack damage when in the suit. This way you can choose between a full AD build or a full tank build without weakening champ** X** a lot.

Champ X's abilities will change depending on whether he is in or out of the suit (but I also haven't thought of what these abilities would be either). The abilities would fit that of tanks and assassins: a gap jump for assassin mode and a cc for tank mode, etc.

Champ X is a great opportunity to have a champion that allows summoners to switch between a tank and an extra damage dealer mid game. I feel champ X is pretty balanced as I have described him, but I would always like POSITIVE criticism. Thanks for reading, and I hope you like the idea.