The Mono's supposedly ship much faster, but yes they are similar to the detolf design.Comic-concepts has the Moducase mono on pre-order:
https://comic-concepts.com/product/moduspace-mono-display-case-moducase-collectibles-shelving/
It's a vertically stacked, narrow shelf design just like the detolfs. Never been a fan of the detolf design in particular, because I hate the idea of having two shelves obscured near ground level.
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