The hopper has a flat flange on the upper end, and is bolted to the stove top. It's not made to be easily taken out and put back. You would have to have the stove shut down.
I seldom open the front door. After shaking, I poke the coal bed a bit through the top loader door, then just dump the coal in the top. Much easier, and if I pour it in somewhat carefully, it's not messy at all.
Once in a while, I do open the front door to wipe off the inside of the glass; probably twice a week. I've been using about 1-1/2 skuttles a day. I have bulk coal, so don't know what that is by weight. I anticipate burning more with the wind and low outdoor temperature that we're getting tonight here in upstate N.Y.
Since my stove is in front of a flat wall, and not in a corner, I really didn't need the optional heat shield for clearance purposes.