I really liked this design so I moved a few things around for a snug fit with the watertight Sterilite 20 quart tubs. 5 spools fit tight. I did not use any spacers but might have to revisit that idea after I add passthroughs.
I cut the 1" sch40 PVC to 13 3/8" for snug fit.
The author remixed this model.