This is the setup I made for my Massey. I found a used ATV/UTV blade and hitch online and bought it, not cheap but a real nice blade. 60" Aluminum, could angle, with a large thick rubber edge.
I made a mount that would fit in my bucket, this is the second one, the first was too flimsy. The upright fit up under the lip to prevent the mount from riding up.
The chains were to hold it in place when dumping the bucket, because snow would fill it up. Also I could use the bucket for scraping and this way the plow would just lift up out of the way.
The blade floats up on those upright bars, and the rubber prevents damage to grass.
I would plow with the bucket a foot or so off the ground and let the blade float. I could tilt the bucket to assist cutting.
I could not back drag with this because the blade is meant to lay down when reversing. This was built for an ATV/UTV with no lift.
I could push snow well into the ditch, or stack it high, because it stuck out so far in the front of the bucket.
It worked well for a couple winters and then I found a nice Kubota snowblower that I modified slightly to fit the Massey.
If you want to make a plow out of wood use treated 2x8 or 2x10 lumber, not plywoood, and make sure to allow it to give rather than break.