Hello. Just a random thought I had. Why not build the 13th Doctor's TARDIS? I admit, my version is a bit too bright, but that's because the crystals in the doctor's interior don't have much light in the top, while the glowstones I used for the crystals can't be "turned off". Hope you like it. Not sure about the size, though, and if everything is placed correctly.
The clock is meant to be the hourglass: