The_IO_Doctor pointed out that there are many changes in the look of the windows on some boxes. Maybe it'd be a good idea to have some "customisation" options: To be able to choose, for example, how the windows will look on the Twelfth Doctor's exterior when you use it.
A room or circuit you need to open in order to fuel the TARDIS before hitting the "refueler". Breaking the circuit will result in time energy being released from the console and damaging the player and reducing other circuit properties by 10%.
protocols, activate a number of specific controls to activate functions or deactivate, such as turn off the tardis, lock coordinates, emergency mode 1 that would return to a coordinate saved along with a voice hologram, command disks among others
Coloured lights potentially for use in interiors, such as is demonstrated by https://minecraft.curseforge.com/projects/colored-lights (This could add some further detail especially to interiors like the coral)