To post in the group you need to build a Classic Space vehicle with between 30 and 100 pieces. You should also build two alternatives from the pieces as you would find on the back of a CS packet. In the spirit of CS your vehicle should not be focused on war or military themes; think exploration, mining and research. In terms of style please draw your inspiration from CS, although Futron, Blacktron, Mtron and Space Police themes are acceptable.
Design: as opposed to a simple aesthetic CS should be judged on the principe that looks follow the function of the vehicle. Think beautifully formed crane arms and radar dishes and not for fancy lights, spikes and arabesques.
Piece Selection: in those 30-100 pieces there should be enough multi-functionality to build 2 other different models (as you would find on the backs of CS packets).
Playability: can your vehicle divide in two, has it got hinged launch pads or a cool claw? The more inventive the play features the better. Remember your vehicle should be sturdy enough to swoosh and roll along the front room floor.
CS factor: how close to the CS styles does your vehicle get? If possible it should push one of the original design schemes further than the original designers.