The theory is quite sound, Alien5044! I made one out of 2x2 wood lumber and expanded metal to see if it worked and it did for a while. It was just that the strength of the materials used and the mounting were not up to the rigors of the work.I often wondered if using steel conduit, used in wiring, might make a good frame with a little wire mesh to push leaves. Light weight to allow it to skim along the turf and allow manual lifting etc., but strong enough to push a pile of leaves without collapsing. Perhaps a "skid bar" of some material, maybe PVC bent up like a sled runner on each side, could be used to prevent digging in or catching on anything. Only thing I'd worry about is a stump or other immovable object busting the whole thing apart.
CAUTION: This is theory only, I have not built or attempted to build this. :tango_face_surprise
It's quite a bit like that white **** that many of you are required to deal with each year around this time. Leaves are the same way, they are quite light as each one is almost nothing, but get a pile up and the weight increases dramatically. On a solid paved surface, the light material construction won't pose much of a problem. But on an uneven ground even the smallest earth clod can bend it.