This model is a command zone box in which you can place you commander as well as slide in trays underneath to slide out and use Spindown sized dice. The file includes 3 trays although only two will fit in the model at one time.  See Differences of the Remix for the details on where I got some of these items.

I made the trays to be able to be slid into the command zone as a box to make the whole thing easily stored. I also added magnet holes so you may glue in magnets to hold the trays inside when not in use. the holes are for small round magnets (magnet hole is 1mm x 3mm aka .04in x .12in)