After a bunch of test prints and some trial and error, I think I have the tolerations of my printer nailed down. I've got the right sizing for the tube, and I've got the interconnecting cleat working. I think I'm ready to actually try printing two full size barrel holders and connect them together.
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One thing that did occur to me is that if I don't have enough chips to fill the entire barrel, they're going to move around when they're inside of my Apache pelican-style case. In other words, the foam doesn't touch them to hold them in. That could be a reason that vertical storage is less desirable perhaps? Anyone have any ideas on how to solve this problem?