The 52qt. Hefty tubs were what I used when I built my rack! I liked the way the uth I used could be fit into the bottom contour well using corrugated plastic and that the length of the tub gave you similar dimensions to a 40B without all the temperature and humidity struggles. What I didn't like on my rack was the wasted space I had using thick pre-fab plastic shelves. Ultimately space economy is why I switched to commercial.
Your rack looks great and it's awesome that it can grow with your crew. I think you'll be really happy with it for many years to come!
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