I built one similar to that one in a rush one night to fininsh a sodding job. They work really well one planning out humps int tops soil or sand. the only thing on mine was that I didnt have any straight cutting edge. I just had some with a slight curve from a Cat grader. I needed it over night so I made a mount to clamp it to my Skid steer bucket. The curve blades wanted to dig in so I took som flat stock and trimmed it itn 4 stripps and welded them to the bottoms of the edges to make it ride flat. I also copied a part where some of the bottom had 1/4 thick expanted metal on the bottom. It helps grate some of the soil off and any rocks or roots that ride up over the front edge. when it got full you could drive over to spoil pile and shake the bucket and sift out the good from the trash.
Its saved alot of time on the finish 1 inch grade of the top soil coat on the gravel yard.