It's a model I found online at The UFO Store. It has flashing lights run by a watch battery and it's held together by a magnet that allows you access to the light switch. I painted it up in a Humbrol metallic gun-metal grey colour and polished it.
It should look real good, much better than the two metal bowls duct taped together. See pic on left. (although I still always liked how that turned out. A two minute solution and very campy!).