Two weeks of studying and a special thanks to j meyer for a very helpful advice.
I have experimented with wings3d after I found that most of my objects have parts with inverted normals...
As before, wings3d is far beyond my capabilities but I could repair the "damaged parts".
This is the good news... here is just the "repaired Viper":
[attachimg=1]
[attachimg=2]
(both with only basic terrain, as shown when TG3 started)
Unfortunately I had to restart all render-jobs for the animation. But I think in 2-3 weeks there will by a HD remake of the teaser...
Also I found a way to repair that absolutely ugly, bad and unidentifiable R2D2 Sound... new one will be better... promised!
Äähhmm - dear Dune... looks like waiting until 2016 for the complete movie