So... ähm... looks like I didn't install this mod properly. I simply installed it via JSGME and did not run the batch file instead of the way explained in the first post.
Making it look like this.
I installed it the way I did (except for forgeting the Tycho.bat) because it is the same order as stated by wolfpack 345 in his video descriptions:
*MODS*** (In install order)
**Grey Wolves Expansion
*Sh3 Commander
Thomsen's Sound Pack V3.2cg
Rbs1_SH4_Effects_GWX_30_71
Rapt0r's Uniforms V2.0 [Grey]
Rapt0r's Uniforms V2.0 [Grey - All Leather]
Patch Rubini´s Underwater dust&plancton v1
M.E.P v6
Optional - ShipVanishingHull for MEP v6
Optional - FSF for MEP v6
TKSS18 German U-Boats Compilation No Eagle
German U-Boats Compilation 2 (only VIIB & VIIC models by WISE)
U-Boot 7c-II
FixAllSubGWX
ARB WideGui 1920x1080 V3
Adaptation for English & Deutsch
Sh3_volumetric_clouds&fog_V2.2
Ricks_GWX_Rec_Man_Final
M.E.P v6- VisualSensors for GWX3
H.sie Hard-coded fixes.
Can I still fix this, without removing all mods? If not, what would be the proper order of installation to get ARB running correctly?