These are some modifications of/additions to the Dice Tower with Secret Chamber II by brimstone326. I made the following modifications:

1. Beveled the bottom edge of Turret v2 (the one with lines already added) purely for aesthetic reasons.
2. Added a tab to the top of the door to make it more easily removable (this removes the need for the gatefillers).
3. Fitted one of dutchmogul's barrels (https://www.thingiverse.com/thing:32016) to fit over the trap door cap, which serves two purposes: it makes the trap door much easier to open, and (in my opinion) better fits the overall theme.

In addition to the files here, you'll need to download the following from brimstone326's model:

TrapDoorv3
drawbridgeV4
DICE_TOWER_II_v2_SUPPORTS OR DICE_TOWER_II_v2