That is an awesome idea, and a great design! Wow, wish we had thought of that, you should market it! Does it still work in sub-freezing temps just as well?
So many great ideas on here, but we will stick with the deep bedding method as we are in Maine and the last thing you want to do in the dead of winter is scoop, shovel, etc. Just keep adding your bedding as needed, maybe every couple of weeks. You don't want it to be wet, and when it starts...