For the boy who is with it, we have designed this Space Station complete with Rotating Space Gun, Flashing Light Intermittent Alarm,and Landing Pad.
It has Sleeping Quarters, Headquarters, Command Room, Control Panels and Reactor, and also Hibernation Unit.
There are many space shapes to complement the station.
Approximate overall size: 450mm high x 660mm wide x 610mm deep.

Also available a Space Station Fittings Kit 1587K or if you just want parts there is a Intermittent Alarm or Assorted Plastic Shapes.