OOK, Once I Owned a Kestrel, is now being revamped. Previously, it was to be released solely on iPhone and iPad. Now, iPhone, iPad, and other mobile devices are dropped and it will be primarily a desktop project. Welcome to the new OOK. Enjoy.
Here is the completed solar system layout, without any stations. As you can see, it's quite huge. The sun isn't apparent in this screenshot but you can see some planets and roids. Note that Mercury-Mars are inside the Asteroid Belt, which is the smaller belt, and all the other planets are inside the Kuiper Belt, which is the bigger one.
As far as systems go, Sol will be one of the biggest. I'm thinking about having the home systems of the Olympians and Humans to be the biggest in the game. I don't really care that realism states that chances are there are far more complex systems - It will still be awesome.
Peace.