That is BRILLIANT!!!! :) Thanx so much for sharing!
Nice idea, but aren't you supposed to store them on their side like most markers?
As for the vertical vs horizontal storage....Copic says you can store them vertically. If one end is juicier than the other you just need to remove the caps and it will even itself out. It has something to do with the alcohol being wicked into the barrel rather than sitting in the tips like water based markers.