I've seen someone drag a large sheet of expanded metal, heavy and stiff, that acted like a large grater (not grader). It sheared down high spots and filled dips and holes. They scattered piles of soli around in bad areas too, speeding up the process. Seems like you could add a frame around the sides like a large box, expanded metal for a bottom, and dump soil or sand in it. Then drag it to shear the bumps and let the soil disperse through the heavy screen as it passes over low spots. Of course that is not as much fun as building rake.
