Death Star - a Christmas tree decoration ("like-a-box" version)

Hi everybody, this model is a remix of the following one: https://www.thingiverse.com/thing:117733

What I have changed:
1) Reduced the count of parts to 2 by joining the upper half and the cannon's plate
2) Made big cavities inside both top and bottom parts to place electronics, LEDs and batteries inside them
3) Made a kind of a screw-thread which is connecting the hemispheres so the sphere could be opened and closed like a box pretty reliably.

You can also download the source in .step