Thanks Andrei,

thats very helpfull! Anyway, I will buy MOI. I used the demo for a month now, made some not to complex hard surface models and it was great to use. The snapping for example is extremely well-thought-out and easy to use!

The only problem is that I have no idea how to make more complex models like the pictured "spaceship".

I guess I will also have to try, learn (and buy) some other CAD programs...