I was looking around into possibly making one or buying one. I decided to check out home depot and looking into a heavy duty rack. They have one that is very nice black finish and the shelf's bottom are very grippe.
Very nice rack at home depot
I wanted something that was very durable and I think I found it.
Also with a metal rack like this it can be very easily cut down to size if you need it shorter they also sold the shelf's if you needed more.