looks like they used wooden hat boxes (you can buy them at the craft store) and just secured them using cut dowels with holes through them to space the boxes. You just run a central threaded rod down the center of all the dowels and boxes and screw a nut on to keep it all tight.
I found this site with directions for this. Hope this Helps!
thank you! it looks like my hubby is going to have to take care of that one for me