has anyone found a decent price on six-way crosses?
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Not sure why original poster needs any fittings at all.
How about 2x4s as the sides of your shelf with holes drilled in them the same size as your tube diameter? Would be as strong. Find a buddy with a drill press.
Looks like it turned out pretty well for you. Since the fittings are the expensive part, I wonder if this design could be built for less with wooden pieces. Also I've seen a couple of people with pull cart carriers built out of concrete form tubes. I wonder if you could improve the disc-preserving qualities of the design by incorporating something like them as half-round shelves. I'm guessing the 8" tubes, which you can find at your local Home Depot, would be the best size for your discs.
And pictures with it loaded up.
that doesnt look like PVC
This is a myth http://www.cmog.org/article/does-glass-flow^^^Theoretically. Like glass, over time gravity/temperature will cause a sagging effect. With glass it takes several decades, and heat contributes largely.
Thanks for the great thread guys! Gave me all the answers I needed to build out my rack.