Later I had to realize that it wasn't possible to implement a planetary engine in FS2. Or better, it's nearly impossible. I ran into bug chaos and had to give up then. But right after that I began with Simerge.
I-war is my favourite game, too.
Especially the freeform flight possibility. Unfortunately, such a feature is too rare in space games.
Thanks for the texture link. I will take a look at it.