Great job, Ron. At what voltage are you running the drill motor? I have one that runs with 18 and it rotates right quickly. Problem with our snow in this area is that it is generally wet and will pack the front face of the plowed area. It would work wonderfully with dry, powerdery stuff.
Mike, I went to a vacuum repair shop and asked about an vacuum impeller. He went into the back room and brought 2 used ones out which he sold for $1 each..
Take a look at a real rotary snow plow. The center has a cone with two or three heavy "sticks" or bars (1 inch square or more and 8 or 10 inches long) sticking out at a right-angle near the tip of the cone that break up the snow right in the center and move it toward the impeller blades. At the corners, especially the bottom two, there is a curved ramp that guides the snow to the impeller to get tossed out instead of building up against the flat face of the housing.
I used a Ryobi drill a cheap one. The batteries that came with it have long neck on them so switch out with a low profile one. The body stays on when charging because i put plug to charge in back. I also put a on-off switch under it. The battery operates the llight and smoke unit plus the drill.
Looks good. You will have to cut a slot in the top, then try it out to see how it works. I tried mine out with sawdust to see how it worked but when putting it to snow needed to make slot bigger as the snow clogged up. Then just glued on piece of plastic to divert the snow from blowing straight up.