Saw this just now walking the dog:
It's a slightly modified shopping cart strapped to the front fork with hose clamps. The two front wheels are each attached to forks as well, also connected to the basket with hose clamps. I didn't think to inspect the headset, but I guess there must be a stem in there to hold it together, but with no bars other than the handle of the shopping cart.
So not only useful, but also welding-free and completely reversible.