Golf cart axel and wheels

I wish I knew how you converted this golf cart into a coop but there is only the picture of it completed here

This seems very well built, but there is no information about it. It looks heavy; does it roll?

Interesting coop. You only provided us with 1 picture and no details as to how you made it.

Cute design, I wish there was more information and photos. Why was the axel needed, does the coop move?