Kallax storage for Marvel United miniatures

Hi everyone, I have designed a simple and light storage platform that fits a 4 shelves Kallax insert ( https://www.ikea.com/us/en/p/kallax-insert-with-4-shelves-white-40423719/ )

I use it for Marvel United minis, but should work well for other 30mm round bases.

Since the space within the Kallax shelves is not much, I have made the platform as thin as possible to fit taller miniatures (not all of them, but most of them). This means that the structure is a bit delicate, but it serves its purpose of sliding minis in and out the shelf.

I have a small printer (a1 mini), so the model fits a 18x18 area. The model is designed to connect on 2 sides (it snaps, but glue is suggested), allowing to fill the whole space on the Kallax shelf insert with 4 parts.

It's my first design and any suggestion on improvements is welcome. Thanks!