Nexus 6P Case and slide out Gamepad

So this is still strictly a work in progress and my first ever design.

You may remember the xperia play phone. This was an android device from 2011 that had a slide out gamepad to allow for true console quality gaming on the go with real controls. Unfortunately Sony never updated this pone and other Phone companies have released gaming phones without true controls (Razer, Black shark etc).

The concept here is to have a sliding out gamepad that sits behind a nexus 6p that will still allow f