That is just a crazy cool idea!  I like it a lot. I just don’t know if I have the space to erect it in my coop. Not to mention, I could just see me, in all my 5’2” glory, trying to wrestle a sand-filled pallet around the coop to fluff the deep bedding without tripping over or impaling a chicken. Yeah, lots of bruises and swearing, I think.
It does give me some new things to consider with an idea I’ve been toying with. I have an old tray my washer used to sit in. A couple of stair stringers and some 1x4’s; sand in the tray; I might-can do that.