Frozen manure grinder thoughts

 We have a small feedlot up here in the tundra of Wisconsin and every year we have  an issue with frozen manure/snow buildup. We try to keep up by scraping it as often as the weather allows but always end up with a foot or so by the end of the winter. We would love to scrape it clean before it melts and turns into a toxic mess running wherever it wants to. I have been contemplating making a small 3 point rototiller like design but much heavier duty to grind this buildup into a powder form so we can scrape it out. I was thinking about the width of a tractor or 5 to 6 feet wide with a heavy shaft sort of like a rock rake drum driven by pto with casters to control depth so you dont hurt the cement. Has anyone heard of such a thing?? I work with metal often and believe I could build such a thing but would love some input. I was thinking about using a right angle box from a NH chopper to drive the thing from the pto. Maybe I could run a driveshaft from that to the end of this beast sort of like a stalk chopper. Any input would be appreciated. If someday for chance I patent this and make a million dollars I could send you pictures of all the money I made. Kidding!