currently building a 14-16 tub rack I got most the plywood cut yesterday. Heck you can build a rac k to fit anywere. I know given some basic details I can design on paper a rack tofit anywere. I even though of building one that would sit around my PC and on topof my desk in my room ( make a cool QT rack as i can use the heat the pc tosses off to warm the rack some lol)
when you build it yourself your only limit is the lack of skill anda budget.