The stroller wheels in front look to just be loose or not turning with the steering wheels input, rather they rotate when the body rotates. a clever way to allow the wagon to turn easier when pushing it.
One can only imagine the amount of man hours that went into this project.
No detail was over looked. The quick change rear end is awesome.
Even the windshield looks to be handmade. I hope the builder was able to get it completed while his son was young and small enough to fit in it.