I recently bought myself a 3 module workstation rack from an Australian based company called Miniature Scenery which I finished putting together last night and thought was worth mentioning (see below photos). I bought the combination containing a paint rack, a parts rack and a tool rack, but there are others available.
While you need to visit the Company's website to download the assembly instructions (they don't come printed with the racks), assembly was pretty straight forward and all the parts fit nicely into place. Well worth considering if you are in the market for a workstation rack