Atlantic Mitsu Storage Rack X-Side

Another user suggested the Atlantic Mitsu 5-Tier Storage Rack, sold for storing CDs and DVDs, as something good for 1KG filament spools. After buying four, I realized that I could combine kits to make three eight-tier racks that would more efficiently fit my available space. I then ordered a fifth but realized it didn't include enough of the full-height side pieces, X-shaped, to build a full eight tiers. Rather than buying a sixth kit just to use those X-shaped sides, I designed my own. This is