I have two of these stacked on top of one another and secured with lag bolts so the stay connected and stable. Isolation cones are used on the legs. I made longer legs for the top unit to accommodate my amp. Works great and is very eye catching. Allows for maximum air flow and gear placement.
http://www.ikea.com/us/en/catalog/products/20105341/
good luck!
http://www.ikea.com/us/en/catalog/products/20105341/
good luck!