I love building model ships, but I recently expanded this hobby into the realm of space model kits. They are AWESOME. Have you ever really studied a space station? They're so cool.
The space station model kits have so much detail too. You really start to grasp the complexity of one of these things. You can also buy launch towers with shuttles and booster rockets. And there are a couple of model solar system kits - even motorized ones - but I like the space station ones the most.
The Gemini space capsule
A completed model space station
“These model space station kits are really fun to build.”