Shelving ideas for 3-high terminals

OK, I'm in a situation that will sound all too familiar. My collecting habits have started to fill my basement. I'm considering building some sturdy shelving that will let me stack terminals 3 high. Well, really "two high" at standard bench heigh, leaving room underneath for things like workstations and other floor units that are approximately desk height or less. One of you has probably done something similar, or maybe you know of a pre-fab shelving unit that is up to the task, giving me the option of investing labor or cash. Suggestions? -- "The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download <http://www.xmission.com/~legalize/book/download/index.html> Legalize Adulthood! <http://blogs.xmission.com/legalize/>