I got a better idea. If I mount a wee motor in the Death Star, and use a fine spring wire connected to the shaft of the motor, Vader's fighter could be attached at the rear center section, which will allow spinning. A custom Death Star / Vader getting away scene, all in one kit. HA! Only if the manufacturer thought of that as a wee add-on to promote sales. Since I modified the Death Star to run of an old 5v Phone charger, there should be plenty enough always on power, not to bother with batteries.Something also to consider is the sound of the spinner. Hallmark has motors for ornaments, but the sound is really annoying. I guess speed is also a factor.
You could make a small moon to hide the motor, although the proximity to Vader's ship might be distracting.
I suppose cutting a small hole in the wall for the motor is out of the question.
Its probably the simplest mod to make such an idea work. Thanks for the brain storm. Will sort out what I can dig up to make it work. Mostly the fine spring wire. Some have used electric guitar string, or piano wire. I think i can get by with jewelry wire, as the length is a wee less than a meter. Having a springy stiff wire, will allow for some curve at that distance, but rotation speed being slow, should not cause wobble if I take care in balancing its center of gravity when drilling the hole for fitting the wire. The nice thing is, that I will not be defacing much of the wee ornament. Will need to heat and pull the hanger eye loop from on top and seal and paint the hole dark grey.
At this time I changed up the X-Wing angle of it view from our seated positions. Having its new position, allows more of its details to be seen, from both top and bottom. It will require a change to the Falcon. Having it raised a wee bit and nose dipped down. May have to swap cannons, since the non-firing cannons look the best.