I bought the steel framed shelving from Lowes that is 4 high. If you need to enclose you can plywood around it and bolt right to the existing frame. I have two sets with a workbench (govt surplus butcher block)between the two and a coupple 2x4's across the top over the bench to add a shelf and hung the lights for the bench from that.
---2x4's---
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---bench--- hope that helps. this was the shelving http://www.lowes.com/pd_101933-1281-CR48...&facetInfo=

Mal: "Y'all see the man hanging out of the spaceship with the really big gun?{ref, Jayne} Man's lookin' to kill some folk. So really, it's his will y'all should worry about thwarting."