I picked up a tip from a woodworker over at LumberJocks, who uses wood blind slats from the ReStore (CHEAP) as separators in the boxes he makes. BoxGuy, (I think). They are very similar in thickness, so the only sizing of them would be to rip to width. I use those for spacing out my knives and miniature carving tools. I bought a used blind many years ago and still have pieces of it around. But one would have to tailor their blade width to the thickness of those slats, if making a pattern like "Square Dance". The asanoha doesn't require slots for nesting the pieces.

Steven- Random Orbital Nailer