As I was writing before. It's the time, what makes it difficult to continue the freeware projects in a proper way. At this kind of projects you have to keep going. Now and then 1-2 hours doesn't lead to anything.
The next step for the CC would be the cockpit, what is seriosly time consuming. Well, when I just think about it, it would be a lot of fun to model it. Let's see if i find some time.