Water Elevator Idea (For Grian)

This is an idea for a water elevator design for the YouTuber Grian. In it, you ca select a floor which you want to go to and the elevator pushes you out at your chosen floor. It's quite messy redstone but it is repeatable. The only flaw is getting the timing right.

Enjoy!

(P.S this is for 1.13 so if the stairs aren't waterlogged, you may need to waterlogg them yourself!)