Bill, the worm should be as close to the ground as possible if you can lower it. You're going to need some kind of containment sytem like a 55 gallon drum especially if the worm is going to stay there. Without you're going to have to make an enormous pile of coal to get even a small amount that will actually feed.
Dan, is there reason for the covering?
If it's for dust control I'm not sure that is really going to do much. Make sure both of those lids are removable. If for example you were getting it delivered from a coal truck the delivery guy could just about fill that bin without even going in the house if the lids are off and its not a very hard delivery assuming they can get the truck near the window. If they are permanent you've created what amounts to a nightmare. Frankly if I got there with a truck I'd have you remove them before I put the coal in because it would be that much work to fill it.
I'd also suggest building up the sides next to the window. The delivery guy or even yourself will want to get as much in there as possible before moving it around in the bin, it's a lot less work to shovel a very high coal pile. Most of it will just slide by itself into place. You can literally move half a ton in bin like that with the first shovel... As it gets built up on the sides it becomes more work but you still want a very high pile.