[Gamemode Concept] Champion Builder

This is a rough concept since there are a few things I'm unsure of how to do but my idea is basically as follows:

The game will start off with a normal 6 ban draft phase. After bans you will create your team's champion! every player can select different champs or the same champ multiple times and based on the player position in select will determine what ability you get.

So player 1 will choose say aatrox for example, this will give everyone aatrox's passive. player 2 will choose say caitlyn, this will give everyone caitlyn's Q. player 3 will choose say teemo, this will give everyone teemo's W. And this goes on for all 5 picks, last pick being R/ultimate.

That's basically the idea, to mix and match champion abilities into 1 big crazy 5 ability kit determined by you and your 4 other team mates. The rest of the game would be a normal 5v5, 2 summoner spells each etc. As for the champ/skin you get to play with all 5 abilities I have no idea, maybe a weird mystery man type skin?

I understand how difficult this would be to actually make but I think if it's possible it would be a very unique and entertaining game mode.

Edit: The only thing I'm really not sure of for this other than the skin is the attack range/stats of the champ, I suppose the easiest way would be to take these from the first champion (aka the passive ability pick) but then everyone would likely go super long range champs like cait which might be annoying.