We need a custom laucher for Android 5 tablets that enables only the WIFI configuration and has a built in Chromium instance. Nothing else should be on.
When the system wakes up, the kiosk app will show a 'set up wifi' button for like 5 secounds. When pressed, the system shows a custom wifi setup screen. Really easy.
When the wifi setup finishes or the button times out, the system will open a Chromium instance pointing to our application.
System hibernation, screen orientation, taskbar and other features like that should all be locked.