Here are my 2 old asteroid ships. The bigger ship (brown) is more of an explorer ship while the lighter gray one is a fuel ship. I had originally made these for a short online story that never got past 6 pages. Both are less then 4" long.

Each was made from a lump of aluminum foil covered in Sculpy. Before baking I roughened the surface with another chunk of foil then sculpted in craters (with various round objects) and minor collision damage. Parts include: wood beads, solder, pins, random plastic chunks, pearl beads, rods and silica gel balls. Anything I had handy was fair game.

Image: Explorer ship: Missile silos (9 black holes), biodome (clear green lump) and hanger door

Image: Closeup of the command dome and communications dish (on the left)

Image: Blurry shot of the aft end with the main engine.

Image: External tanks (red and silver balls), reaction control thrusters

Image: Fuel ship: External tanks (red and silver balls), reaction control thrusters

Image: Landing pad with cargo ship, airlock with tube (black), communications dish

Image: End of refueling arm, side of docked cargo ship (some jet minus wings)

Image: Control habitat with designation number