Arg, I was so sillly couldn't believe it...
It wasn't the env_cloudtrims, it was the planet_clouds_blue_diff, i've already copied with the others into the assets folder- I thought file replacing would work like in X3, the new extension file replaces the original file, that was my miskake. I forgot to replace the Detail texture and the mask texture in the material libary... but XR works not in the same way with texture files. If you replace only the diff then the game only replaces the diff and the other unreplaced clouds_blue_diff entries are ALREADY USE THE ORIGINAL FILE. Ah, I've seen it, but I haven't realized it- The planet uses the Gasgiant AND the Cloud texture and I thought it was two cloudmeshes. Silly. Ok, now it works normally in the mod-folder, dont need the other replacing method any longer.
Hm, ICO_hr, how did you manage the moon texture in DeVries? They use a 1:1 Texture on the Planet with the clouds where they had to use a 2:1 planetary texture, so I replaced it (2048x2048) with a new texture (4096x2048) it worked fine, but the other moon uses the same texture file- and I got a problem with it- see the top of the planet in screen. how did you managed it?
http://imageshack.com/a/img41/1364/j08r.jpg
EDIT: Now working on the Cloudtexture for the planet to create a better one...
greetings, MJ Fire