Do a search on the forum. I found a thread with good plans for a cart built from pipe. hard top storage cart
Even usta have pitchers. We spent about $90 at Home Depot and voila, works like a champ.
A couple of notes though. The plans call for holding casters onto the pipe with u-bolts. We found that you needed a small piece of wood between the casters and the pipe to make it stay firmly in place. Otherwise the casters tend to slip around the pipe.
Plan to use some locktite on the pipes once you get them set just right. Otherwise you will be forever tightening the many joints.
We used some pipe insulation sleeves covered with duct tape to cushion the pipes and prevent them scratching the top.
Total time to build was about 2 hours. Works great.