When mine was new, I made a similar device in both a narrow version, and I believe it was a 30" wide one, to do final grading.
While it obviously would move loose material fine, I found the machine lacked the weight, and reach, to be effective at moving packed soil efficiently in that way. Making it impractical for me.
If you wish to build a simple version to see if it works in your conditions, just bolt a piece of plate over the teeth, with threaded rod, through a piece of angle iron on the back side. You can use a welder to add some lips where you need them, that will keep it from shifting.