I've been slowly working on this for a few months as I learn Tinkercad. Presented is a stack-able miniature storage system where each post screws to the level below it creating a stable platform. I've been printing/tweaking as I go but the current version allows me to utilize the full vertical space of bookshelves for miniatures

Each tray is the exact size of the other ones allowing you to stack any base above another base. 40mm fit 10 exactly. The 32mm could fit a few more but I kept it 10 due to my squad sizes. For the 25mm I set it up with 21 spaces and, although not included, started working on an insert that takes up the space of 9 25mm and changes it to a 60mm.

I haven't decided how I want to cap off the top layer which is why I don't have a file for this yet.

Rhino is off center(left to right on the vehicle facing). This was intentional as my Rhino all have pintle mounts on same side