Yeah, I know, I was kind of looking for an instance object to mirror the parts and then work on the model, but when I did not find one I just started modeling away without caring for the model not being aligned to the center axis of the modeling area.

I had a huge problem with connecting, joining, welding the surfaces, and if I´d start again I would really start with a primitive and then building up the model from there.

As written before I was not able to finish the model, since my 30 days were up :( Maybe I´ll continue when the next demo version is available for 3.0 or so ;)