I find that if you search long enough, sooner or later you'll find a better version of what you thought was a great original idea but haven't even built yet LOL. The idea was a minimalist collet holding blocks that could index to one another so you can make any planform shape to fit a wider range of storage boxes. The tab system is a bit more complex than what I was envisioning, but I like the general idea. Maaaan, gotta get me one of those 3D printer thingies.