Tray remix

Hi so I redesign the tray on tinkercad to fit another dice tower, it my first attempt at redesign so ani advice would be apricated. I wanted to make the area where tower goes some sort of storage place for dice bur got no idea how to do it again first attempt.
Tray, I got from
FosDoNuT- https://www.thingiverse.com/thing:2416038
Tower, I use
Dice Tower - Wrought Iron Lattice - No Supports by kdausman on Thingiverse: https://www.thingiverse.com/thing:4937191