Goat & Chicken Proof Emu Feeder

I have built a few different emu feeders, mostly to keep the goats out.
Now I'd like to keep the chickens out too, so it was back to the drawing board to make something without having to purchase any materials.
You can make this one with a removable/lockable top access (to put food in and keep rain, goats and chickens out) - just place it high enough so the chickens cannot easily fly right into it (the access holes for the emus).
Placed on the outside of a fence with an access in the upper back area to load the feed and where emus can get to the holes in the front through a fence would also be ideal.